TKS for the video - tough bastards is right!

A .50 cal round ball only weighs 175 to 184gr., if .490" or .495" in diameter.

A .730" (12 bore) pure lead ball would weigh 583.3gr., roughly, while a .710"(13bore) ball would weigh 538.5gr. Cast either in hard lead and the weighs would be roughly 20 to 30gr. lighter depending on the alloy.

A .682" ball for my 14 bore ML rifle weighs 482gr. in pure lead and 466gr. in WW alloy.

A true 14 bore ball, ie: 693" would weigh 500.0gr. in pure lead and about 480gr. in hard lead.

In a SXS 12 bore, I would be inclined to use a 13 bore ball or slightly larger, say .720" with a decent .022" denim patch.

I think hunting anything big would be fun with a 12bore SXS & be certainly up to the task, if loaded appropriately, of course.