Also, mandatory warning if you haven't heard much about the cartridge and you decide to shoot your gun...
The .41 Long Colt was originally loaded with an outside-lubricated heeled-base bullet, like .22LR. This type of bullet has drawbacks in larger calibers, and as other comparable cartridges were introduced with superior inside-lubricated bullets, Colt switched the .41LC to use this type of bullet as well. Since this required reducing the outside diameter of the bullet from ~0.410" to ~0.386" to fit entirely inside the case, a hollow-base bullet was used to
theoretically maintain accuracy if the new ammo was fired in an older gun. (In practice, hollow-base bullets that expand to grip larger-diameter rifling don't work very well, leading partially to the cartridge's reputation for poor accuracy.)
Around 1890 when the bullet design changed, new Colt 1877 revolvers were supposed to have changed from ~0.408" groove diameter to ~0.401" groove diameter to work better with the new bullet, but from what I've been told, the actual groove diameter of individual guns varies substantially. Some newer guns have the "old" 0.408" bore, with others have "In Between" bores in the 0.403"-0.405" range.
(Herein lies
another reason for the cartridge's reputation for poor accuracy.)
Due to this factor, it's important to slug the bore of your .41LC 1877 before you shoot it, and be prepared to order a custom mold matched to the bore diameter of your individual gun. Do NOT count on being able to get good results using off-the-shelf bullets.