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It depends on when that ruger #1 was made. Mine is from the 1970's and has a nice long throat and I can seat a 500 gr. bullet out far enough to get past 1800 FPS with a cast lead bullet. A serious load that hits hard at both ends. I shoot only my home cast bullets in the 45-70.
Check out a copy of Ken Waters Pet Loads. He shows some stiff loads for use in stronger guns. The only place where I disagre with him is in using those loads in a New model 1895 Marlin. One theykick like hell and two, the lever will snap open at the shot. Almost an automatic ejection systen and I wasn't even close to his loads yet.
Paul B.
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