30 Caliber vs. 7mm for Long Range — Litz Offers Analysis

Bryan Litz, Ballistician for Berger Bullets, has authored an excellent article on bullet design, What’s Wrong With .30 Caliber?. This story originally appeared in Precision Shooting magazine, and now can be read on LongRangeHunting.com.

In this article, Bryan analyzes the design of long-range bullets, from .22 to .30 caliber. He notes that while 30-caliber bullets can have very high ballistic coefficients, 30-caliber bullets must be very heavy to match the BCs of the 6.5mm and 7mm projectiles. As the chart below shows, it takes a 240gr 30-caliber bullet to match the G7 BC of a 180gr 7mm VLD. But most 30-caliber shooters don’t use those ultra-heavy projectiles because the recoil is excessive and because it takes a monster cartridge burning lots of powder to drive 240-grainers to optimal velocities. Litz notes: “Heavy recoiling rifles are harder to shoot accurately. Even if a shooter overcomes the mental aspect of heavy recoil, the ’system’ is more sensitive to minor imperfections in shot execution. This may be another reason that drives .30 cal shooters down to the ‘middleweight’ 190-grain class bullets instead of the proportionally heavy 220-240 grain bullets.”

Litz concludes that the heavy 7mm bullets are a better choice than the biggest 30-calibers (except in unlimited weight “heavy guns” where recoil is not a factor.) Bryan writes: “Even a moderate 7mm chambering is capable of delivering 2800 to 3000 fps with the heavy 7mm bullets, much faster with magnums. The heaviest .30 cal bullet requires a big magnum just to get to 2800 fps. So the first problem is: you can’t get the heavy .30 cal bullets going as fast as the heavy 7mm bullets! Even if you could get the same muzzle velocities from the heavy .30 cal bullets, it would take much more powder to do it, barrel life would suffer, and you’ve only achieved parity with the 7mm. The various negative effects of the incredible recoil are really just the ‘nail in the coffin’ for the heavy .30 caliber bullets.”

New Ballistics Book from Bryan Litz
If you are interested in learning more about bullet design and ballistics, Bryan Litz has authored a brand new book, Applied Ballistics for Long Range Shooting. This new resource includes experimentally-measured Ballistic Coefficient (BC) data for over 175 long range bullets of various makes. Bryan’s new book is hot off the press — copies should be available by July 1st. CLICK HERE to pre-order Litz’s book for $39.95.

SK Rimfire Ammo Rivals Popular Wolf Ammo

Wolf Match Target and Wolf Match Extra ammunition is justifiably popular with competitive 22 LR shooters. Wolf Match Target, at $4.20-$5.00 per box, shoots as well as many types of 22 LR ammo costing much more. We recently chronographed Wolf Match Extra ammo (using multiple chronographs), and it showed lower ES and SD than much more expensive Eley ammo. But Wolf rimfire ammo is often in short supply.

SK Ammo — Made by the Folks Who Make Wolf
What to do? Here’s a tip — if you like Wolf Match, try the SK match ammo. SK Jagd Munitions actually manufactures Wolf Match ammo. The gold-box, SK-brand ammo is made in the same German plant as Wolf , and testing shows SK can deliver the same accuracy and reliability as Wolf. The SK Standard Plus is the equivalent of Wolf Match Target, while the SK Match is the equivalent of Wolf Match Extra. SK offers a wide range of rimfire match ammo at affordable prices. Here are current offerings at Champion Shooters Supply:

SK Match: $6.50 (50-rd box)
SK Rifle Match: $6.00 (50-rd box)
SK Standard Plus: $4.50 (50-rd box)
SK HiVelocity: $6.00 (50-rd box)
SK Subsonic: $6.00 (50-rd box)

USER REVIEWS from MidwayUSA:

SK Match:
“I’ve tried over 20 different brands of match .22LR in my Anschutz 1907 including the various Wolf, RWS, Aquila, Lapua, and Eley loadings and the SK Match was one of the best. It was VERY consistent. 10 shot groups of 0.25″ to 0.3″ are the norm at 50 yards. Unlike most of the other less expensive ‘match’ ammo, the SK has yet to throw a bad flyer in 500 rounds. The Eley Tenex Ultimate EPS and Match EPS gave similar results. I consider the SK Match to be the best value for my rifle.” — D. Fletcher, TN

SK Standard Plus::
“I bought this because the Wolf MT is getting hard to find. This is the same ammo as the Wolf. I tried it in all my rifles and get about the same groups as the Wolf. Had no problems with this ammo and recommend it highly.” — H. Disharoon, VA

“Oh No — The secret’s out! For an exceptional price, this is absolutely the best .22 target ammo. I use it mainly in my Custom Ruger 10/22. CZ 452s just love this stuff. A majority of the silhouette shooters at my club use ‘SK Std Plus’ during matches and practice. I have shot cases of this stuff and can only count very few fliers.” — J. Batterton, AR