Your wife is an exceptionally fine person.
the loads were fairly generic 60 grains of goex ffg for the 63. 80 grains for the 69 caliber and 70 for the Mississippi. Minie bullet, 450 grain ball, 230 grain ball. I went out today and checked the two Springfield rifled muskets with Pyrodex RS today. The minie balls were all over the map- velocities ranging from high eights to low 1000s. Not enough compression there to make it cook
The velocities with the 69 musket and patched ball were right in there with the same load of ffg.
The velocities recorded with the minie ball .58 loads were higher than usually listed with the 60 grain load. Twenty year old publications give it 750-900 fps. Different powder and components I suspect. A Zouave Rifle shot the same load as I recorded in the table at 970 fps. The 1863 springfield we used was tighter bored and is altogether a pretty fine rifle. I wil also say that my personal marksmanship with these long guns has been one-half ass compared to what I'm used to doing with percussion pistols and revolvers.