how much gain would a .280 AI in a 22" barrel? my brother has been thinking of reaming his out to 280AI but his barrel is only 22 inches. He said if he can get 3000 to 3100 FPS with 140 loads out of a 22" barrel then he is happy because he is a chicken when it comes to reloading and can only get 2850 140grain for his 22" 280 REM.
