You're not working with the higher pressures that pistol or rifle generate when loading shotgun. Keep your loads at 17grs of Clays and it doesn't really matter what primer or wad you use, and I say that AFTER looking in the Hodgdons reloading manual. Your Clays is just fine. Primers are hard to find today, so don't worry about them at the load grains I just gave. Matter of fact, it's pretty hard to get in trouble with any powder load of 17 grs. Might not be the fastest or best, but it's plenty safe. JMHO