26 in. Remington 1:12 twist. I have access to IMR 4064, CFE 223, Varget, Vihn 140. COAL is not an issue as I will chamber one at a time and not us the magazine. Thanks for the info.
You don't have a fast enough twist
Montana Marine got them to shoot in his 1 in 12 308:
http://www.longrangehunting.com/forums/f19/215gr-berger-hybrid-308win-104197/
Altitude...you are right Feenix. Looks like he is shooting at 4000 ft minimum.