Cool! - That all makes sense. I'd expect a charge or a patched ball to only be in the 175 to 200gr. considering what was normally used in dangerous game rifles of around 8 bore.

Their velocities would still be fairly low, about 1,300fps MAX with the round ball, but consider most military loads with hollow based Minnie-style bullets were quite tiny compared to what was used with round ball. In the ,.58;s a mere 60gr. and in the .69's, another 10gr. at 70gr. Thus, for the 8 bore, the 118gr. charge with 1,569gr. bullets sounds quite appropriate.

The slug might make 1,000 fps, but probably not.