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Believe it or not, the little 22-243 is the bad boy on the block and it is nothing real special, just a 6mm necked to 22 in a very efficent case.
But be warned, when you get past 3,200 fps steel starts to get worn and a barrel does not last very long.
.22-243 Middlestead
Bullet Berger HP MEF
BulletWeight 30 grs
Powder Alliant Reloader 15
PowderWeight 50 grs
Primer Federal 210
Brass Make Winchester
Velocity 5278 fps
Group 0.554 (inches by 3 shot at 100 yds)
Submitted Date 3/18/2002 1:06:00 PM
Most of the larger capacity cases will not drive a bullet as fast as the 22-243. The larger capacity cases in 22, 20 and 17 are so far over bore that they simply do not work in the attempt to gain velocity. Probably the best example of this is the 260, 6.5x06, 6.5x284 and the 264 WM. My 260 will push a 120 Sierra MK to 3,215 fps. The bigger cartridges will just about duplicate the 260 velocity while burning a lot more powder, for little or nothing.
The moral to the story is bigger is not always better in the speed race.
Best,
Ed
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