Remington primers are tapered on the end where as no other primer is. I don't have one in front of me but from memory I believe they're also a tiny bit shorter. The 28ga hull has plastic going over the primer pocket opening and limits how far a primer will go in. I don't remember the number drill number right now [ broken foot- can't go down to the reloading room and check ] but a quick in and out and the plastic is cleared so any primer will work. I also use Mec reloaders - 600, 650, grabber, and 9000H - and never in 45 years of reloading have I had a problem with any Remington 12 or 20 ga hull. I'm not sure why any of you guys are but I guess it is what it is.
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Paul Harm
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