A number of .45 ACP reloads will not feed properly in a Sig 1911 TT, but will feed just fine in an M&P .45. The cartridges will feed just fine and rapid fire in an M&P .45, but will fail to chamber in the Sig. It tends to jam into the chamber at an angle. When I drop the mag and gently realign, it’ll feed fine, although every so often I’ll find one that doesn’t seem to want to chamber fully. What can I do to further diagnose the problem? I’m loading Rainier 230g, set to 1.265 COAL. I’m crimping the mouths to .472, and SAAMI spec says the mouth should be .473 (there was one in my batch of 10 that I tested that was at .473). SAAMI spec for chamber should be .4740 at the mouth. Thus, the cartridges at the mouth should be well within spec. The maximum length of a bullet that will fit in the M&P 45 magazine is 1.314”, and the SIG is 1.319”. Measuring bullets on diagonal adds .022” with these Rainier 230gr bullets, making a maximum diagonal length of 1.292” COAL, sufficiently above the SAAMI spec of 1.275” so as to be a non-issue in magazine feed issues. Thus, with a 1.265 COAL, the length is within SAAMI spec and well within tolerances for magazine feed/binding issues. Any others with experience with the SIG 1911 TT? Does it have a tighter chamber tolerance than SAAMI spec? Thanks!