I can attest that shooting .410 in 3” magnum with my Bond Arms Texan is all there!

I’m sure that a .45/70 would be a significant increase.
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"Filet that fish? Hell naw! I'll scale him, gut him, fry him up in grease, take him by the head and tail, and play him like a French Harp!" - Uncle Paul sometime in the 60s.