If your lock has a detachable pan then you can draw file the lockplate then go to 150, 220, and 320 grit paper. For the rest of the external lock parts except the frizzen its small to needle files then the same grits. Some go to 400 but I rarely do.
After doing a number of locks of the same model, one gets to know where the divots and scratches are. Mostly the same places every time. Sure beats forging and filing to shape!