#17 Postby DenisA » Fri Mar 20, 2020 8:31 am
Both SS media tumbling and U/S cleaning have there pros and cons.
For years I was U/S cleaning everything, went to SS tumbling for a couple of years and now I'm back to U/S cleaning.
For anyone looking at buying a SS media tumbler, understand that repeated tumbling peens (mushrooms) the case mouth which creates a lip on the O.D and I.D of the mouth. The lip on the I.D will catch a scribe and will shave copper from the bullet when seating and possibly firing, the lip on the O.D will catch your nail.
Its manageable but requires a lot more chamfering and deburring.
Below is a picture of a peened case next to a chamfer and deburred case and then another picture of a single peened case. You can see the irregularity or ripple on the surface of the case mouth which is a mushroomed edge. This case has probably been cleaned 4 times in a SS media tumbler without Chamf & deburr. No doubt that the amount of time the cases are left in the tumbler would change the rate of peening.