progressive vs case trimming
I'm finally going to get serious about reloading and will get a progressive press. Although I will eventually reload rifle cartridges, my focus is on feeding my 45 auto habit. I am trying to figure out how case trimming comes into play with a progressive press.
My understanding is that you should trim a case after it is resized, since it will lengthen during that process. You should probably clean the primer pocket at that point too...right? How does that fit into a progressive operation? Certainly, you don't remove the shell after the depriming/resizing operation, so what do you do?
Also, how should I set the crimp? Should I just set the die to seat on a factory loaded round? I don't even see that a factory round is crimped. Is the crimp that slight?