Maybe the experts here can shed some light on this - My local gun store has several SB1 framed 357 and 44mag guns and I really want one in 357 to ream out for the Max, but I don't want to invest in the gun withh the SB1 receiver. Yes I know I can get an SB2 gun ini another caliber and then go through the accessory barrel program to make what I want, but that is just more cash. Does anyone know what the pressure chamber cutoff is on the SB1 receiver and still be safe. The SAAMI specs I am getting straight from the SAAMI online source is as follows:
357mag is 35,000cup
44mag is 36,000cup
30-30 is 42,000cup
35Rem is 37,500cup
12ga 3" is b/w 12,500 and 13,000cup
45-70 is 28,000cup
I guess what I don't understand is why the 45-70 is put on an SB2 frame and the 357/44mag is put on SB1 frames with such drastic pressure differences. What am I missing here other than the fact that the 45-70 can be loaded up higher in modern firearms (like the Ruger #1, Encore, Handi) and the factory doesn't want liability? It seems there isn't alot of pressure difference between the pistol mag calibers and the 35Rem or the 30-30 either, but maybe the mid - 35,000 pressure is the cutoff for the SB1.