dogngun - I wouldn't shoot that Iver. The old top break .38 S&Ws transitioned from black powder to smokeless sometime shortly after 1900 depending on brand. The black powder guns are dangerous with smokeless loads. Pull off one of the grips to check - if it has a flat spring, its and old black powder gun, a coil spring is a smokeless.
I shoot an Iver and a H&R hammerless top break, a Colt Police Positive, and just got an Enfield top break from 1944 that hasn't been to the range yet. Its a fun cartridge to shoot!