DD: Dunlap's recommendation of chamber-wall thickness assumes pressures in the order of 55,000 psi. Even for the nitro-proved 12-bore rifle cartridge, we're still only talking 10,000 psi to maybe 15,000 max.

Still, I fully agree with you on the split reciever. I have a nice GP take-down too, but it will remain a shotgun.

...or maybe a Paradox?!