I'm still new at this Handi game and have a couple of questions. Are the older H&R and NEF frames strong enough to safely handle BP ctgs. such as 25-20, 32-20, 32-40, 38-55 and smokeless ctgs. like the 218 Bee, 22 Hornet? I plan to machine one piece monoblocks so barrels are not a problem. Also, should I want to buy a new SB1 shotgun for the receiver what gauge is best so I can readily sell the barrel to someone wanting it for a stub? Thanks, Piney Creek