MAx C.U.P. pressure for 1873 springfield trapdoor 45-70
Looking for loads for my 1873 springfield. I have been shooting 30 grains of IMR 4198 topped with a cast 405 grain .459 lpf which was giving me a speed at the muzzle of about 1350 which is equal to the bp loads ment for the rifle. I looked at the IMR website and found a load I want to try. 46 grains of 4064 ,same bullet . Says velocity is 1534 fps with a CUP pressure of 17900. Does anyone know the max pressure for a Springfield 45-70. I might add the site listed this load for trapdoors only.
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