The key to using lead alloy bullets in any cartridge is matching the alloy hardness to the pressure/velocity being created. A high pressure/velocity cartridge such as the .30 Carbine will more that likely require a hard alloy (like linotype) and a gas check to prevent leading at top velocities. I would also recommend a hard lube. The gas system also adds another dimension. I have ordered a Redding 120 grain RN gas check 4-cavity mold to try. I have almost 50 lbs of linotype set aside. In my .357 revolver my favorite full power load is the Lyman 168 grain Kieth cast of a wheel weight/linotype alloy, lubed with Blue Angel lube over a stout charge of 2400. I never have leading problems, but then my bullets are also sized to .358, the size of the fronts of the cylinder. I also shoot cast bullets with success out of a (GASP) Marlin 1894C .357 Magnum with microgroove rifling. Bullets are again cast of a hard alloy, gas checked, sized .359/.360, and lubed with Blue Angel. The Redding 180 grain flat nose feeds perfectly and shoots small groups with a stout charge of WCC820.

Bill