Yes the difference in size is minimal you can cut off excess matirial after you start the ball in the bore if you want.
The compartment is for the storage of cleaning patches.
22-72
was a 38-40 black powder
Typically 50 to 75 grains of ffG powder.
$850-$1,995
No published sn data.
50-300 USD or so
You will have to tell us if you are talking about black powder or center fire.
try the Kittery trading post
don't believe any such item as 58 cal. black powder pellets. but, there is a 58 cal. slug for the 58 cal. black powder rifle
depends on overall condition
Impossible to value a weapon with just the caliber and serial number to any degree of accuracy.