I can tell you from experience that it won't out penetrate a 400 grain 45-70 Pill at 1400 ft per second either nor a Good 30 Cal bullet

and since we're now talking about "single" projectiles the Shotgun has ZERO advantage over a rifle....in fact most would say it's more of a hindrance
Like I said Shotguns are for Birds
Besides the Fella clearly said this would be for Blackies....
30-30 will do..........but I agree the 44 Mag is a DAM good choice too, especially in a Compact Marlin Stainless 94, 6 lbs and 10 Rounds of Hurt in the tube