I drive to another city to pick up primers and got back and realized I was given Magnum Small Pistol Primers instead of regular. Should I return them or is there a rule of thumb that can use to use these and not have to make the trip back? I will be loading 9 mm for steel target loads; I am currently loading 4.2 grains of Bullseye behind a 115 grain LSWC. What change, if any would I make to use them?

Thanks!!

Though since I posted this thread, we realized we know someone who works right next door to the place we bought them so switching them out is the best option. One of the guys getting them is a beginner reloader so handing him a twist like that isn’t a good idea.