I'm looking to build a rifle for the 195 bergers... I usually use bartlein barrels. But the only barrels with 8 twist I can find are benchmark and krieger... I live in Pennsylvania and elevation is no more than 2000 feet so I think the 8 twist would be better than 8.5.... any input would b greatly appreciated.... even caliber choice? I was thinking a 7 rum would push them the fastest...