I am not new to reloading but I am new to the 45 ACP, I have a rock Island. I got some brass, ordered a LEE 4 die set and tried to reload some tonight. I am using a 230 gr. round nose Lead bullet. I did 10 and tried to chamber some. They wouldn't let the slide close all the way, it was close but not closed. After messing around some I discovered that if I set the bullet a little deeper it worked fine. Question: My Chip Mc Cormick mag says overall length at least 1.260 ? At 1.260 mine wouldn't chamber. At 1.240 it worked great ! So.... Is this over all length critical ? I suspect the Bullet Dia. is trying to push inside the barrel as the bullet is stepped down some at the rounded part start. I haven't tried to fire the Gun as it was dark outside. Will the gun still function OK with the shorter over all length ?? Any help is appriciated.