A leisurely twist rate like 1:12 really means that you are limited to the lighter bullets - you'll note that most of the posters here are recommending a 155gr bullet of one kind or another.

My own Krico 650SS has shot 155gr Lapua Scenars since forever, having settled on the most effective load out to 900m - I've never shot further than that. I'm not going to give any load details, except to agree that those here suit their guns very well.

Doing your own testing means never having to say to a well-meaning pal that 'your load really screwed up my gun!!!'

Remember that the original AI - as issued for service sniping - also shot a 155gr bullet with great effect on the BGs.

tac