I have 38/357 (I shoot both). Went to Cabela's yesterday and told the guy I wanted small pistol primers and when he handed me the box of 1000, I didn't even notice the "MAGNUM" in red letters on the box till I got home. Can I substitute 500 for 550's for both 38 and 357? Or should I try to send them back? I am within close driving distance.