I have a Marlin 45/70 Guide gun and in researching loads for it I found some pretty stout loads. When I started to load for it I started at the low end and worked up from there. When my loads stated to hurt me from the bench I dropped to the next level of loads that gave me the accuracy that I wanted and stayed there. My load ended up being 44 grs IMR 4198 behind a Hornady 350 gr FN for a velocity of 1800 fps. I can shoot 20 rounds from the bench without too much trouble. As I get older I seem to notice recoil more. My suggestion would be to try a lighter load especially with a curved metal butt plate and a straight stock.
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