Interesting. I shoot mine occasionally too. I reload the .38 S&W brass cases, which are still available, with 12 grains of black powder topped off with a .361 lead bullet.
Although made in 1894, my revolver still looks new.
“...I reload the .38 S&W brass cases, which are still available, with 12 grains of black powder topped off with a .361 lead bullet. ...”
Very smart safety practice.
No original gun made to fire black powder should be fired using smokeless powder cartridges, no matter how gentle the load. Pressure curves are quite different.
Break-top revolvers with the American-style barrel catch (mounted on top strap) are prone to wear. They can appear tight but may unlatch themselves with no warning, tossing the fired case and hot gases back at the shooter. Parts are not available and cannot be repaired readily.
Revolvers with the Webley-style catch mounted on the standing breech are less prone to wear problems. But please bear in mind that the British cartridges fired from these revolvers (principally 455 and 380 in various Mks) develop low velocity and modest pressures.