DaveMcC, I just read your post about your .30-30 H&R. You mentioned you thought a cartridge producing 42,000 P.S.I. average SAAMI max might be questionable when "used on a shotgun frame".
Actually this is no problem for most 20-12 ga. shotguns. But the shotgun must be modified to accept these cartridges.
People have gotten into trouble in the past by trying to put center fire barrels on their H&R shotguns. First of all the firing pin diameter of the shotgun is much larger! These guns need to have a smaller diameter firing pin and a bushing installed into the receiver to match this firing pin. And the barrels need to be fit correctly!
The case head thrust of calibers like .357Mag, .22 Hornet, .30-30 are easily handled by the 20-12ga. break actions, IF the barrel is properly fit!
The NEF SB-2 (the Handi-Rifle receiver) can handle cartridges up to 62,000 PSI average max. But NEF wants to do the fitting of barrels themselves! I don't blame them!
Regards! DaMan
[This message has been edited by DaMan (edited August 24, 2000).]