Home Forums Hunting & Shooting Ask The Gunwriters Ask John Barsness Questions About "1-12 vs. 1-9 Twist in .223's"

You mean the 22-204 gets 3700+ with a 50-grain bullet? That's .22-250 velocity.

8.5% extra case capacity means about a 2.1% increase in velocity at the same pressure, which is a long way from 200 fps, assuming the 3500 fps or so the .222 Magnum is capable of with a 50.