When I had my MRC 1999 built in .358, I specified a 1 in 12" twist in order to stabilize heavy bullets if desired. I ended up using 225 gr Partitions for my Africa trip and they worked well at somewhat over book maximum loads. Since then, I have settled on 200 and 225 gr Barnes TSX or TTSX.with TAC powder, as written about by Mr. Barsness.
It did shoot 3 250 gr Hornady Spire points into one .377" inch hole, edge to edge, at 100 yards, though. My buddy spotting for me could hardly believe it except he saw it.
Last edited by Calif. Hunter; 09/04/20.
