Ruffcountry, the new .45/70 brass, ie; RP, FED, WW, Starline, etc, is as strong, actually stronger in primer pocket strength than belted mag. brass - This is due to it's rim diameter. The head area has similar strenght in modern actions. Marlin tested a lever gun to 70,000psi (their test) without any problems and absolutely no stickiness of the bold upon extraction- form the M95. This is not to suggest 70,000psi loads are OK in that rifle - It's max allowable re-loading pressure, according to Marlin, is 43,000psi/cup.