.308Win vs. .308 Win Imp.

[sub 10/22]

Has anyone had experience rechambering a .308 to improved?? I am considering this for my Omark 44D to launch 55gr projectiles, but am unsure if there will be much performance gain. Quickload is suggesting i might get 4200fps with a N110 or slightly slower with N120.
Cheers

 

[Mysticplayer]

Performance will improve max 5% over orig case. Alot depends on the barrel and projectile. sometimes the increased vel doesn't help because the barrel tuning likes it slower.

Only one way to find out.

Jerry

 

[sub 10/22]

Jerry

thanks for the info. based on quickloads calculations i might get another 200fps. Barrel twist is 1 in 12.

Need to get it onto the range and work up some loads , really looking forward to seeing what these custom 55gr .30cal projectiles will get up to.