« Reply #3 on: April 24, 2011, 04:10:13 PM »
Curt,
I think shooting 410 shells in a 4570 will result in a lot of semi burnt powder in the barrel and very poor velocity. The approx. diameter of a 410 shotshell cup (this is also the gas check to seal the bore) is around .41" and the bore diameter of the 45/70 is .458. Also, if the shot cup does engage the rifling it will start to spin and will result in a "smoke ring" shot pattern which isn't much good for hunting. Also, you have a firing pin alignment problem because the base diameter of a 410 shell is about .48" and the base of a 45-70 is .505".
BB
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RIP Tom: Tom Nolan, ( bikerbeans) passed away this afternoon (02-04-2021).
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