[John Rogers]

If it were me I would have a muzzle loader expert/gunsmith go through them and then if the bore doesn't look too bad, fire away. You would need a bit of black powder, pillow ticking, pure lead round balls, several new nipples and some percussion caps. The age can be let slide and we have some shooters at our monthly matches that shoot rifles from the revolutionary war! Just make sure the gunsmith knows what he is doing and use light (30 to 40 grains of FFG powder) and you should be fine.

The oldest rifle I have was made in 1905 and oldest pistol was 1861. They shoot just fine.