If it helps, I load 230 XTP's and cast bullets from lee mold (230 tc) to 1.210". Works in my Brown, my Springfield TRP, my friend's Wilson and his Colt Rail Gun. Of course I could be wrong, but I thought all SA was Imbel steel. The NM designation basically just indicated that all of the fitting was done in the US. Wanna kill these ads? We can help!