i own a .357 mag revolver. some company manuals call for magnum primers, others like remington call for just 5 1/2, federal is 200, and yet i read in winchester about using spm. how do i know lets say i want to use cci primers , how do i know if i can use them in a .357mag shell. with what type of powder. what i am asking is what if i am using winchester case, or remington case, and using hodgdon powder. do i need several different brands of primers. i know i will need small pistol primers, but when do i know if it should be a magnum primer. do i change primers because i use a different reloading manual. i am not going to start reloading untill i feel comfortable with everything. what happens when a store carries only winchester cases, and only non magnum primers. plz help . aj