If you are not checking your cartridge length you will get an inconsistent crimp and this could be causing your problem. Case length is important. That being said you should be able to use most shells without trimming. I set up my die so that I get a firm grip on the bullet without denting it. I've had no feeding problems doing it this way. I don't normally measure the actual crimp. It is possible your chamber is a bit tight too. What I discribe above is good for general use. If you are aiming for absolute accuracy then what you are doing is the right way. In any event, every chamber is a bit diffrent and you will have to figure out what works best for your pistol if accuracy is your chief goal. As long as your rounds are at or slightly below listed spec.s everything should work fine.