If you prep your brass once, it is done, cut the primer pockets, to uniform the pocket size and depth, then cut the flash holes inside to out, trim to uniform length, when loading with a taper crimp, seat as a seperate stage, then crimp the case mouth until straight. The case loaded head-spaces on the case mouth, thus the case must stop on the case mouth at the chamber to lands cut, can not jam inside the lands.
If you get a bench mounted RCBS primer tool you can feel the primers seat a good hard seat on ever primer on every case is good.
