I think the sst is a little better than the Bt,have taken deer with both in different calibers.Since the sst came out have taken deer with them in a rem 260,7/08/30/06( 150 and 165 gr) and a 270 wsm and 200 gr muzzleloader bullet sst.Shots were from 45 to 200 yds and as of yet all shot completely thruogh the deer,these were all behind the shoulder hits.