If it locks up tight when you have pulled the trigger and you hold the trigger down it is probably good to go.
Rig it to fire in SA with a cord
do it a few times
Now my eyes are playing tricks on me! Do the chamber walls of that cylinder look extremely thin to anyone else?
Looking at your photos, the headstamp on the ammunition shows .44 Magnum. I sincerely hope that is not what you have loaded into the cylinder, as it will send parts of the venerable revolver into low earth orbit.
Mic the chamber throats. They may have been bored out or someone has removed metal from the outside of the cylinder.
This chamber looks bigger than the others. There's no step down inside any of the chambers either.