Sierra 175 Matchking G7 Bc

7mm-08 Remington 175 Grain Barrel Length = 24” COAL = 2. That I know. 229 Hornady 0. The BC in 12" twists run. 232 - i7= 1. 5 mm match bullets have BC values between 0. My M1A's seem to like the 175 Sierra hpbt or the 168 A-max's at the long line. So by calling for a BC of. Rifle - Match Ammunition 2700 FPS, 2718 FT-LBS, BC. 2500 fps calculated using the G7 drag. Sierra MatchKing bullets have very thin jackets and are held to exacting tolerances in diameter and weight. Sierra Bullets is excited to announce a new product for 2015; Tipped MatchKing bullets, available in 100 and 500 count boxes. SIERRA MATCHKING HOLLOW POINT BOAT TAIL. Given that pushing it's unmatched conception, improved additionally right now accommodated zero greater than alone. 230 Sierra 0. Remington 308 Winchester 175 Grain MatchKing Boattail Hollow Remington 308 Winchester 168 Grain. They are also not true hollow points that will expand. The ELD series is another animal entirely compared to the Sierra as shown by the G7 BC's below Sierra 155 - 0. A long time ago I call Sierra about long range loads with the. 35 and a Form Factor of ~ 0. Shooters' Forum. For this rifle, which allows seating the bullet longer than max col, the increase in bc over the 168 hpbt smk makes a noticeable difference at 600 yds. Public acceptance was slow, due largely to unflattering comparisons to the 30-06. I have only shot out to 550yds and the drop is spot on for a 0. Their accuracy has been acclaimed worldwide and they have been used to win more target competitions than all target bullets from other manufacturers combined. Both bullets may be accurate at the same powder charge but velocity will likely be different and the Hornady will shoot flatter due to its slightly higher BC. 317, and the Sierra 142gr MatchKing has a Litz G7 BC of 0. 581 below 2,050 fps. Since Sierras announcement of their line of Tipped MatchKing's, I've gotten a lot of requests to test them for BC. new sierra tipped match king. The Hornady bullet has a length of 1. Initially, the 308 was chambered in the bolt action Model 70 rifle. Obviously if shot across the course in an NRA style match there are better choices in particular at the 600 yard line. 519 and their 175 gr Match BT Long Range Target bullet has a G1 BC of. 62mm) Drag Profiles. Federal uses the best ingredients in this proven recipe with carefully designed brass cases topped with Sierra's incredibly consistent and concentric 168 grain hollow point boat tail bullets. 308 Winchester) ammo rifle Federal 175 grains AmmoSeek. The exclusive primer design provides the best sensitivity and most consistent ballistics in the industry. NOTE: “Accuracy with flyers” includes the raw averages including groups where the shooter called a bad shot before rechecking the placement of that shot. The result was the new 175-grain #2275 MatchKing® bullet. Stringent manufacturing controls give you what many experts and international shooters consider the most accurate match round available from a factory. The 30cal 168gr BTHP (e. 275, but was outpaced by the Heat Shield Tip at 0. 277 110 Spitzer 1815. 001’’ The bearing surface is approximately 0. When compared to a G7 BC, the G1 is typically higher. 168gr Sierra Matchking Tipped Drop Data 175gr Sierra Matchking Tipped Drop Data. HoneyBadger™ doesn't need hollowpoints and does not depend on them for performance. These 168-grain Sierra MatchKing bullets are extremely accurate and reliable. I have not used the TMK's. 243 G7BC Sierra 175 SMK (Litz computed) =. Takes hogs, deer & coyotes. Introducing the Sierra GameChanger hunting bullet: the perfect combination of Sierra's legendary match accuracy coupled with deadly penetration. These Hollow Point Boat Tail bullets have a small meplat to produce a higher ballistic coefficient. Data Source Drag Function BC Form Factor; Sierra : G1 0. 308 Win and was told that the 175 gr. Nick Harvey's manual suggests 42GR for 165-168GR projectiles, doesn't indicate specifically which projectile though. 5 to whatever it would be in G7 (something less than. 277 130 Spitzer Boat Tail 1830 1833. My apologies, I did not clarify that my previous statement is only valid for the Sierra Matchking bullets. 308" 175gr Matchking 0. What I might do is order some Nosler RDF's for my upcoming long distance shooting. This is because the G1 drag function values are higher -- the ratio of the G1 drag function and G1 BC should be the same as the ratio of the G7 drag function and the G7 BC (it depends on the velocity at which the BC is measured). hpbt matchking point blank range computed for 5. This is the bullet that the US Palma team has been using G1 BC G7 BC Drop Drift Velocity Advertised Sierra. I have been using the Sierra Matchking HPBT 168-grain bullets for reloading. What makes this bullet special is its low drag, Sierra claim a G1 Ballistic Coefficient (BC) of 0. 240" Bullet Style: Hollow Point Boat Tail MatchKing G1 BC: 0. I have only shot out to 550yds and the drop is spot on for a 0. G7 BC Values-Here are the G7 BC's of the most common bullets used in competition and target shooting. 308 175gr Nosler RDF HPBT (100CT) RDF 30 Caliber 175 Grain Bullet (100ct) For those wanting to squeeze the most performance from th. This is a discussion on Help !!!Searching for Ballistic Data within the FN Bolt Action Rifles forums, part of the FN Rifles & Shotguns Forum category; I'm hoping a few forum members can provide me "definitive exacting data" on the following 7. , the length and the G7 BC. 223 REM STEADFAST 77gr SMK Match Reman is constructed utilizing a Sierra Matchking hollow point, boat tail projectile loaded in remanufactured Lake City military brass. 500 G1BC Sierra 175 SMK. ; The form factor is the ballistic coefficient divided by the sectional density (i=SD/BC), and is a measure of how closely the profile of the projectile matches the G1 standard projectile. 659 while the 190 grain 30 cal bullet has a G7 BC all the way down at. 505 Part Number: 2275C Quantity: 500. Sierra Bullets is excited to announce a new product for 2015; Tipped MatchKing bullets, available in 100 and 500 count boxes. 570 despite it being 10 grains heavier. The major advantage of adding a tip to the bullet is the reduction of drag, producing a more favorable ballistic coefficient. As you'll notice in pictures this thing is a VERY long bullet. It has a rated velocity of 2700 ft. 3 g) Sierra Match King Hollow Point Boat Tail bullet. hpbt matchking point blank range computed for 5. 659 and a G7 BC of 0. Following Sierra's introduction of Tipped MatchKing (TMK) bullets, Bryan Litz of Applied Ballistics LLC has received many requests to determine the Ballistic Coefficient (BC) of these bullets through testing. The Custom Competition Bullet (CC) - Nosler® has blended the accuracy of its Custom Competition™ bullet jackets with its own ultra-precise, lead-alloy cores to create the performance standard for match rifle and pistol bullets. set zero at 345 yards. Then the military and other shooters realized that the venerable 168gr was not consistent at 1000 yards due to insufficient ballistic coefficient (BC). Sierra has enhanced a segment of the MatchKing line by adding the acetal resin tip, thus crowning the Tipped MatchKing (TMK) bullet line. There's no information about G7 BC yet. In gelatin it retains a little less weight and achieves a little less penetration, but is still 95% of what the others achieve. In review: The Sierra 175gr TMK’s have a substantial improvement of about 10% in Ballistic Coefficient (BC) over the Sierra Match King and still better than the previously best BC 175gr 308 bullet, the Berger Tactical. OK, OK, if you must have a specific bullet weight, I'll tell you IF you will agree come come back here and report your 10 shot group size at 500 yards. The result was the new 175-grain #2275 MatchKing® bullet. It takes the diameter of the bullet, the grains, and the standard shape, and spits out the BC. 00, the density of the bullet in question is the specific gravity. cartridge to the sporting public as the 308 Winchester. bullet for the ever-increasing 6. I have only shot out to 550yds and the drop is spot on for a 0. 308 Winchester shooters to stay supersonic at 1,000 yards. Match primers are utilized in these top quality loads resulting in consistent powder ignition and continuous powder burn. Sierra Rifle Bullets. The Sierra 168-grain MatchKing (No. 570 despite it being 10 grains heavier. 35 and a Form Factor of ~ 0. cartridge to the sporting public as the 308 Winchester. It uses a 175-grain (11. Calculates the ballistic trajectory of a bullet fired from a rifle, handgun or other firearm. COME UPS ROUNDED TO 1/4 MOA. #2 This increases wind brackets for the 175 TMK to 5mph, as opposed to 4 mph for the 175 SMK. 308) 175 Grain HPBT Sierra MatchKing (SMK) is the gold standard for 308 Winchester precision rifle shooters. 308" 155gr Amax 0. There are other new MatchKing offerings as well, in centerfire competition’s favorite calibers of. 62×51mm NATO Match-grade round specifically designed for long-range sniping. Bullet Lengths I am in the process of adding bullet lengths to the library so that the drift can be easily calculated. The last lot of M118 was produced in 1982. 264 inch bore has recently enjoyed a resurgence of interest. Rocky Mountain Reloading is the Best Place to Find Great Deals on Bullets and Cases for Reloading. 581 below 2,050 fps. This is a discussion on Help !!!Searching for Ballistic Data within the FN Bolt Action Rifles forums, part of the FN Rifles & Shotguns Forum category; I'm hoping a few forum members can provide me "definitive exacting data" on the following 7. Several rifle manufacturers currently produce 6. 218 - i7= 1. GameKing® bullets feature a boat tail design to bring hunters the ballistic advantage of match bullets. bullet for the ever-increasing 6. The Mk262 military load on the left. It uses a 175-grain (11. 308 Winchester was the defacto cartridge for precision rifle and long range shooting. 223 REM STEADFAST 77gr SMK Match Reman is constructed utilizing a Sierra Matchking hollow point, boat tail projectile loaded in remanufactured Lake City military brass. 336 Part # 28554 - 1 in 9" twist or faster For bullet dimensional details, click HERE. 277 130 Spitzer Boat Tail 1830 1833. 300 Winchester Magnum 220 grain Sierra Matchking HPBT~ The. The tipped 168 went from. 168gr Sierra Match King (SMK) @ 2650 feet per second I have the 147 grain bullet with 2750 fps. 223 Rem 69 Grain BTHP S223M2 Ammo - 20 Ro JavaScript seems to be disabled in your browser. 224 75gr Amax? Sierra's 77 TMK is listed as. starting velocity (in a 24″ barrel), the bullet remains supersonic out to 1,300 yds. 30-06 versus Boar include the 168gr SMK (BC. No matter where you hunt, the species you pursue, the climate, or the terrain, Swift (trademark) bullets are designed to provide superior performance over a wide range of conditions. (I just realized I'd forgotten too. This is the bullet that the US Palma team has been using G1 BC G7 BC Drop Drift Velocity Advertised Sierra. Ballistic Trajectory Calculator. 00, the density of the bullet in question is the specific gravity. The New RDF linw was designed from the ground up to provide exceptionally high BC's, which create the flattest trajectory and least wind drift possible. 30 caliber Sierra 175-grain MatchKing (l. Match primers are utilized in these top quality loads resulting in consistent powder ignition and continuous powder burn. By comparison, Sierra’s own advanced 183-grain 7mm Matchking has a. Approved for public release; distribution is unlimited. 5 MOA accuracy and while FNH does not offer a guarantee, their rifles had to hold a high level of accuracy during the FBI trials and are typically expected to shoot about. 308 spbt 180grian could you make a 7mm 284 cal bullet for elk 168 thru 175 grain range with g1 bc range 615 thru 660. Black Hills first released information about this ammo back in February, shortly after SHOT Show 2014. So, we may be hard-pressed to extract the drag vs velocity curves from the data to compare. When compared to a G7 BC, the G1 is typically higher. 2500 fps calculated using the G7 drag. I have not used the TMK's. For over 35 years, Creedmoor Sports has been serving the precision rifle shooting community. Proper shot placement assures quick, humane kills. The MatchKing is a favorite of many champion shooters, both military and civilian, due to its extreme stability and accuracy potential. 7mm rifles from Remington and Browning. 270 140 Ballistic Tip 445 Nosler. If you look at Sierra's website, you can compare the regular MatchKing BCs against the new Tipped MatchKing's BCs. 713—most impressive. 308 target work. 338"), 210Gr, Tipped TSX BT, 50ct Box. 308” Bullet Weight: 175 Grains OAL: 1. 0,447 pro rychlosti pod 793 m/s. These heralded loads combine the legendary Sierra® MatchKing® Boat-tail bullet with Federal's proprietary delivery system. If you like to shoot, work on guns as a business or hobby, or just own a gun, this is the place for you! For over 75 years, shooting sports enthusiasts have turned to Brownells. Since then, the cartridge has been chambered by virtually every major arms maker in almost every con-ceivable action type. 488 BC) and 175 SMK (. How "optimistic" is the BC value provided by Hornady for the. Zero, 59 deg F. The LR M118 is pretty warm load and will cycle the BCG very fast. 7-300 Norma Improved Ever since we built our first. 4 and that is just ahead of the 80 gr BTHP 223 match bullets that the service rifle guys shoot routinely at 600 yards. The 7mm counterpart is the 180 grain Berger VLD. It seems that Sierra Bullets has now gotten onboard with their new "Tipped Matchking" or TMK. 3 I would think). 300 Norma Magnum, we’ve been thinking on a cool wildcat to make from the case. This pig was saved for eating, and they are quite tasty. 338 are better suited for the speeds of the 338 Winchester Magnum, 338-06, or 338 Federal and may fragment if pushed by the 338 Lapua Magnum and impact game at close range. 308) 175 Grain HPBT Sierra MatchKing (SMK) is the gold standard for 308 Winchester precision rifle shooters. Calculates the ballistic trajectory of a bullet fired from a rifle, handgun or other firearm. 168gr tmk bc litz, 175 tmk g7, annyone hunt with a sierra tmk, black hills. 070 better in favour of the 110g. 308 Winchester 175 Grain Sierra Match King B JavaScript seems to be disabled in your browser. They are also not true hollow points that will expand. 5 cm ) g grs BC G1 0 100 200 300 mm 0 100 200 300 50 100 150 200 250 300. velocity fps 3400 3295 3193 2996 2807 2624 2448 2278 1659. 00 ELD 168 - 0. 168gr Sierra Match King (SMK) @ 2650 feet per second I have the 147 grain bullet with 2750 fps. For under 1600 they call for a BC of. Ballistic Coefficient (BC) values can, and usually do change in value with changes in velocity. • Sierra MatchKing, 30 caliber – 175 grain projectile was selected. Sierra Bullets has just introduced a new 7mm bullet with a stunning 0. View our complete list of cartridges by caliber to find the perfect ammunition for your needs. The 175 grain Tipped MatchKing (TMK) bullet is an excellent choice for F-Class (F Open) matches, as well as 3-Gun and various other competitions. Clicking search results means leaving the protection of Startpage. Produced at Lake City Army Ammunition Plant. I have shot Sierra bullets quite a bit and really find them to be accurate. Back To All Precision Ammunition. 56 mm) is the heavy-for-caliber 90 grain Sierra MatchKing, with a G7 BC of. , the length and the G7 BC. These things are what sets Precision Ballistics LLC apart from all the rest! The variation for all bullets within a box does not exceed +. The Berger 140gr Hybrid has a Litz G7 BC of 0. 5 Grendel Sierra 123 gr. This dedication to excellence has given Federal a competitive edge as an ammunition technology giant. 5 Grendel 123 gr. Powder Bul Weight C. The Mk262 military load on the left. Most Sierra bullets are soft points, but there are a few hollow points. The sectional density is the weight of the projectile in pounds divided by the square of the diameter (SD=W/d 2) and is an important number when considering penetration. 230 Sierra 0. 500 G1BC Sierra 175 SMK. This high BC allows the bullet to resist wind effects better, while its mass makes it retain velocity longer. 308 Win Match Sub MOA 168 GR. Produced at Lake City Army Ammunition Plant. (I just realized I'd forgotten too. Paul Box penned "How Much Difference Does Ballistic Coefficient Make" on ballistic coefficient (BC) and its use in the hunting world and the limited amount of bullet drop and wind drift that occurs with bullets that have a large difference in BC at…. For a long time, the. Nosler RDF 175 Grain 30 Cal (308 Diameter) HPBT bullets are build for the shooter wanting to squeeze the most performance from their competition rifle. 740 Here is what sierra calls for 1880 fps and above BC of. 308 175 SMK? [/quote] Also want to echo that this was a great discussion and I learned a lot. Peterson Cartridge Co is committed to producing ammunition that is extremely precise and accurate. 56mm 77gr Sierra Tipped MatchKing (aka TMK). Sierra Bullets Bc. 308" 155gr Amax 0. The ELD series is another animal entirely compared to the Sierra as shown by the G7 BC's below Sierra 155 - 0. 7768) because it has most definitely proven itself as a perfectly viable candidate for. Give us a call at 1-888-223-3006 for pricing and to place an order. 236 Sierra 0. The Scenar was designed for Palma competition where the bullet weight was limited to 155gr. (Note: for those who use ballistics programs capable of computing trajectories using the G7 drag function, the G7 BC s are posted in RED – even for FB bullets, out to 600 Yd. Thats a shorter bullet than the regular 123 SMK with a much better BC. 486 between 1800 and 2800 ft/sec and. In the last 60 years their line of bullets has expanded dramatically and continues to do so. Let me walk you through the process we used for load development and what we found. 62mm) Drag Profiles. 168gr tmk bc litz, 175 tmk g7, annyone hunt with a sierra tmk, black hills. If you know anything about marketing, then it's obvious why we've been stuck with G1 BCs for so long. This XM118 ammo comes loose packed in 500 round cases and is very accurate and reliable. 0 grs Varget wtd Lot 4295 W/W new cases Fed. 212 Hornady 0. 505 BC), most shooters seem to think the slippery 175 is a better bullet overall and it definitely has an edge at longer distance-less drop. Two of them are G7's and the one listed as 123 Scenar (CD) doesn't show a BC. 462 for the SMK 168. 5mm 123 grain MatchKing Pointed entry. 230 Sierra 0. 5 Grendel vs 308 – The Part Everyone Misses. Then the military and other shooters realized that the venerable 168gr was not consistent at 1000 yards due to insufficient ballistic coefficient (BC). 510 above 1,635 feet/second. 338 are better suited for the speeds of the 338 Winchester Magnum, 338-06, or 338 Federal and may fragment if pushed by the 338 Lapua Magnum and impact game at close range. AMERICAN EAGLE 5. The BC in the 14" twists run. 780 and Under 1600 a BC of. Federal 168-Grain BTHP Sierra MatchKing There are oodles of match grade. Most Sierra bullets are soft points, but there are a few hollow points. Related searches for 175 grain sierra matchking data Related searches Federal 308 175 Grain Sierra MatchKing 175 Sierra MatchKing Load Federal 175 Grain Sierra MatchKing BTHP 175 MatchKing for Sale Sierra MatchKing 175 Gr 308 Diameter Sierra MatchKing 308 Sierra MatchKing 168 168 Gr Sierra MatchKing In-Stock Connect with Facebook See what your. 277 140 Hollow Point Boat Tail 1845. The exclusive primer design provides the best sensitivity and most consistent ballistics in the industry. The Nosler 175gr Custom Competition has blended the accuracy of its Custom Competition bullet jackets with its own ultra-precise, lead-alloy cores to create precisely balanced bullet stability and balance. 30 caliber 155 TMK (BC. This bullet is a Nosler Partition 7mm Caliber 0. The new Tipped TSX features the same 100-percent copper body with multiple rings cut into the shank. Superior Shooting Systems LLC is pleased to introduce its new 115-grain 6mm RBT (Rebated Boattail). In 1995, Sierra worked with military ordnance experts to produce a superior long-range bullet for the M21, M24 and M40A1 sniper systems. 240" Bullet Style: Hollow Point Boat Tail MatchKing G1 BC: 0. HPBT MatchKing to 2600 f. 496 at the speeds a 308 is sending it along (2600 fps). 62×51mm NATO Match-grade round specifically designed for long-range sniping. 450 N/A 322” 96” 1289. (I just realized I'd forgotten too. bullet for the ever-increasing 6. With "Anonymous View" you can visit search results in full privacy, and keep on browsing: They’ll never know you were there. 337 for their 7 mm Match Target VLD bullet and has since published the G1 and G7 BCs for most of their target bullets. 4 and that is just ahead of the 80 gr BTHP 223 match bullets that the service rifle guys shoot routinely at 600 yards. Sierra Bullets is excited to release load data for four of our newest bullets: the 22 caliber 95 gr HPBT MatchKing #1396, 6. 282 is a much more accurate representation of the bullet at all speeds, the numeric value of the G7 BC is lower. 5x55mm Swiss cartridge has got two things going for it in Vintage Military Rifle. 212 Hornady 0. 20gr or less for 80gr through 108gr bullets. 450 N/A 322” 96” 1289. These Hollow Point Boat Tail bullets have a small meplat to produce a higher ballistic coefficient. Data Source Drag Function BC Form Factor; Sierra : G1 0. Since Sierras announcement of their line of Tipped MatchKing's, I've gotten a lot of requests to test them for BC. 308" 168gr Competition 0. 62×67mm) is a belted, bottlenecked magnum rifle cartridge that was introduced by Winchester Repeating Arms Company in 1963. Midsouth offers some of the best prices on. I have shot Sierra bullets quite a bit and really find them to be accurate. Yet the bullet is still light enough to allow for a high velocity (3005 fps) within the 1800 ft lb muzzle energy limit (set somewhat arbitrarily for this comparison). If I want a non ballistic tip bullet with a higher BC I'll go to Berger's. than the old 175 SMK. This is an improvement over the 175 SMK, with an advertised G1 BC of. The major advantage of adding a tip to the bullet is the reduction of drag, producing a more favorable ballistic coefficient. The hollow point boat tail design provides that extra margin of ballistic performance match shooters need to fire at long ranges under adverse conditions. loads to choose from and, in truth, they all shoot pretty darn well. set zero at 345 yards. I am considering trying out the new 77 TMK, but very curious about the discrepancies in the stated BCs. 606 between 2,050 fps and 2,400 fps. Black Hills’ three 77 grain (5 g) 5. They are also not true hollow points that will expand. 462 for the SMK 168. Next time you are at the range, see what some of your long range shooting buddies are using and use what they use. I made an assumption that these were the bullets he had available for use in his Garand for normal CMP competition distances. 337 for their 7 mm Match Target VLD bullet and has since published the G1 and G7 BCs for most of their target bullets. 3 g) Sierra Match King Hollow Point Boat Tail bullet. Usually there is only +. Along came the Berger 105 Hybrid with a BC nearly as high as the DTAC, but being nearly 10% lighter guys found they could push it hard enough to more than make up for the small BC deficit. The result was the new 175 grain #2275 MatchKing® bullet. Becoming Graf & Sons. Thanks 257, I went to JMB who I had used previously to make a range card and when I clicked on the library link for the Nosler and then selected the G7 rather than G1, the BC did not change from. Clicking search results means leaving the protection of Startpage. 450 N/A 322” 96” 1289. 308" 175gr Matchking 0. The facts below are according to Midway. It has a rated velocity of 2700 ft. At 600 yards plus, it will matter. Black Hills has added a new Sierra high BC bullet, the. These extraordinary loads combine the legendary Sierra MatchKing bullet with Federal's proven quality standards and stringent manufacturing controls to create a round that is as accurate as a match load, but available from the factory. Nosler 175CC vs Sierra 175 MK- 30 cal like the Match King is sort of the Gold standard in the 175 bullets for 308. 505 BC), most shooters seem to think the slippery 175 is a better bullet overall and it definitely has an edge at longer distance-less drop. What started as a small dream has become a multi-million dollar international business selling ammunition, reloading supplies and accessories. ; The form factor is the ballistic coefficient divided by the sectional density (i=SD/BC), and is a measure of how closely the profile of the projectile matches the G1 standard projectile. 263 - i7= 0. They also very close to the 175 tipped bullet. The “average without flyers” is the average group size with those “flyer” groups not added in. BC varies with velocity. Read HERE for details. 659 and a G7 BC of 0. Thanks 257, I went to JMB who I had used previously to make a range card and when I clicked on the library link for the Nosler and then selected the G7 rather than G1, the BC did not change from. Today's AR15 Hunter Range Report features a highly anticipated new round from the folks at Black Hills Ammunition, their new 5. 230 Sierra 0. 30 Caliber/7. Bullet Lengths I am in the process of adding bullet lengths to the library so that the drift can be easily calculated. 212 Hornady 0. 308 175-gr TMK ammo surpasses a Sierra MatchKing loading for long distance shooting, retaining more velocity downrange while bucking the wind well. The MatchKing is a favorite of many champion shooters, both military and civilian, due to its extreme stability and accuracy potential. In the last 60 years their line of bullets has expanded dramatically and continues to do so. This calculator will produce a ballistic trajectory chart that shows the bullet drop, bullet energy, windage, and velocity. 236 Sierra 0. It was definitely efficient, penetrating as deeply as a 175 grain Nosler Partition. If trying the tmk in another rifle, would have to balance the increase in bc against any real difference in velocity by increasing the seating depth. 308 Winchester, and with good reason: It offers an excellent blend of overall length, BC and downrange trajectory.