Like I said a real head scratcher. Starline brass, WLR, 440gr gas check bullet, 37gr of H110. Shot thousands and thousands out of the Performance version. Shot so many rounds out of that gun in fact I had the barrel liner backed onto the cylinder causing a jam. S&W reset the barrel but to 12 thou. This new gun has a cylinder gap of 9 thou. Anyway I’ll get some Federal primers in the meantime and order a Cylinder and Slide longer pin. Failing that I’ll sell it and get a Freedom Arms in 50 Wyoming Express