Re: Acceptable group size?
We were shooting 3/8" plate out to 1000yds and the 338/378wby with the 300gr MK at 2975fps was still punching holes through at 700yds, and at 1000yds it almost went through.
The 8mm Mausers were punching cleanly through at 300yds, but never fired on the 700yd plate to check there. We'll try some 1/2" plate next time.
We're going out this weekend with the M14 and the Win. 308 for a shootout on the plates, my wife and I. It will be her first time shooting the steel, she'll love it.