[marktwain]

Very hard to get proper ammunition for a .41 Colt. However, there are ways to do so, if only a few rounds are needed.

Ammo, if properly stored, can last over a hundred years.

[Inyo-Mono]

There is one place I know that offers .41 Colt Black Powder cartridges.

https://www.buffaloarms.com/41-long-colt-loaded-black-powd-amobp41lc.html