Removing primer crimp and other useful tips.
Buy yourself a better primer catcher, and avoid combing the floor looking for them
Create a group of cases whose volume, length, neck and wall thickness, primer pockets, flash holes, etc. are all as uniform as possible.
The effects of different primers on ammunition accuracy is a topic that interests many, but which relatively few can easily test with precision. Most competitive shooters are limited in their access to a 1000-yard range and a quality accuracy-testing facility. Thus, experimentation with primers is often done at shorter ranges, relying heavily on chronograph results to help select primer brands or lots by velocity uniformity and accuracy testing.