Don't be afraid to try regular shotgun primers or the ones made for muzzleloaders. Try both to see what you or your gun likes. Some people like the newer made for muzzleloader 209s. Others do not. They are reported to reduce the "crud ring". They also are reported to cause misfires in guns that never had them with the regular 209s. I am sure you can find someone here who swears by them and others like me who swears at them. My gun never had a misfire, it just didn't group as well. As for "pushing" the bullet, I have heard that one before but wonder if it really happens on not. The best groups in my gun are with the regular made for shotgun Winchester 209s. I gave away the made for muzzleloader Cleanbore Remingtons but do have some made for muzzleloader Winchesters (WML209) that I plan to give a second chance after this season is done. After my first round with them, I have a feeling most of them will be given away too.