I have put 100 factory rounds or so through my .45 andam starting to load my own .45s for my Sig. I am using a Used Lee Loading Die for a .45 Auto. It did not come with any directions. Anyhow, I only loaded 20 rounds just in case I did something wrong. I had two out of the 20 not chamber all the way. I pushed the slide forward to seat the bullet and it shot fine. I noticed that when I de-prime &sized the cases, they were nice and round. After I put them through the other sizing die, therewas a little flare onthe edge of the neckto make the bullet seat easier I guess. After I seated the bullet into the case, the flarewas still there. Is this what may have caused my rounds not to chamber or could it be due to the case being too long? All the factory rounds had no problem.Didthe caseflare in the die because the case was too long? I know, I know, I should havemeasured the cases but they were only shot once factory cases and I didnt think they would stretch being only shot once. I will measure every case from here on out.But what may have caused the problem? Any answeres? The round nose factory bullets are longer than the hollow points that I reloaded. So, the overall size, if I seated the hollowpoints all the way to the shoulder would have been shorter overall compaired to the factory round nose FMJ. So I did not seat them all the way. I left them so they would be the same length. Was that my problem? Does it matter if they ar shorter overall as long as the case is the right length? I am all messed up.