Looking for Help here.... My Hubby and I been reloading ammo for years on a RL550 with no problem in all sorts of calibers; .45acp, .223, 9mm etc... We Just decided to handload for my M&P so we got some componets ( once fired fed brass, CCI primers, Win 231 and 165 gr JFP's) and loaded 20 or 30 to go test. Well the chamber would not fully close on about half of them and the ones that did chamber we both caught hell trying to get the slide to unlock and cycle. I check my OAL and its within the limits according to Lymans 47th and Lee loading manuals. In lymans it did mention something about not reloading for Glocks and simular pistols with unsupported chambers. Hubby is a 1911 shooter for life and loads mostly for his guns but wanted to try something different and load for mine but he cant figure it out. What are we doing wrong here guys?