These are two quotes from my post when I finished my 7mm-08 AR10
Dont worry, you can load the 162s down to mag length. I have shot them out of my bolt gun at 2.750" and did great with them over varget. Start around 39gr and work up slowly. I bet you will see 2650 to 2700fps safely once the barrel is broke in. Also, bad [censored] rifle
Followed by
And the 7-08 Guru has spoken.
My barrel is having to be throat reamed to to fix a small imperfection from the chamber reamer, but I should have a full range report on 162 Amax loaded to mag length within a month, and also with in that month I hopefully will be able to go take my class with Fireman and he can tell you how he likes it too.