I've been tumbling my balls for years (not something you may want to say in mixed company) It doesn't get rid of the spurs but if you let them tumble for 2-3 hours, it can revel air pockets just under the surface. I also weigh my balls too (another remark which should not be spoken in mixed company) :rotf: As I don't do much shooting in the cold and snow, it helps to past the winter months and gives me something else to do. I've had a few people tell me it's a waste of time but until they can outshoot me, I think I'll just keep on doing it. If you tumble them just right you do get "dimples", nothing like on a golf ball but it isn't a smooth surface either. Some folks will believe that you're shooting swaged balls but only you really have to know.