Ok so the the idea of a 300WSM varminter shooting 125gr BT's at 4,000fps is very, very appealing for the red mist factor. However a short barrel life doesn't appeal - so I'm trying to get a ballance between splat & barrel life. A mates 32" 1-14" twist Barnard actioned rifle shoots the 125gr BT's at an easy 3,500fps which got me thinking. Build a 32" barrelled 308 with the minimum twist required to stabilise the 125grgr BT (1-16, 1-17" twist) with maybe a 3 groove barrel also to help in the quest for speed. An accurate 3,600fps might be achievable from the 308 combination. Stupid idea?