I am wanting to load sjsp 158 grn. magtech with 550 cci primer using 6.4 grns. unique. should i put a roll crimp? also my rcbs carbide die instructions say i should trim cases so that they have the same amount of crimp. how necessary is it to trim?
It should be obvious that i am new to reloading and any help is greatly appreciated, i am just trying to get bullets to go downrange without getting my head blown off, so high accuracy is not my goal right now