I've read that the Glock 21 and 30 tend not to function well with semiwadcutter ammunition. The good news is that this doesn't appear to be the case (at least so far) with the Glock 37. I just tested mine tonight with a handload: Hornady 185gr JSWC, 4.0gr Solo 1000, Fed 100 primer, 0.470" crimp, 1.052" OAL. All of the rounds fed and functioned just fine, despite being even stubbier than than the commercial .45 GAP loads. They were soft-shooting and accurate, too. Has anyone out there tried any GAP handloads with cast LSWC bullets?