There's a reason most serious BPCR shooters shoot the 45-70 - recoil tolerance.
Anyone can shoot a few rds from a 45-120 with no ill effects, especially from off hand. But from the bench or prone with x-sticks, it's a different matter.
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Agreed. I own a 45-120 by C. Sharps that I purchased used. For me it was a great deal as it came with dies and brass, long range tang sight and it was all ready in Canada, no import hassles.
The rifle weighs approximately 12.5 lbs. I find that 3 shot bench groups are quite tolerable. However it is cumulative. After 15 rounds you are starting to feel it. I shoot off sticks occasionaly but never prone.My cast load is a 500 grainer over 100 gr Pyrodex.
If I had been buying new I would have chosen the 45-70 simply because brass is so much easier to find and it is more pleasant to shoot.