I was always perplexed on why my regular speed 1500-1700 rpm machine polish better than my 3000 rpm machine
I tumble rocks as well as cases. , with Rocks The longer it stays in contact with the Grit , the more it smooths
after a while I found that slower speed machines gently fold the cases on the media with a rolling action. While the Hi- Speed . slam the cases on top of each other. This would included dry media and pins.
True a Hi speed might take s a little less time. . But myself I do all my Tumbling @ night , overnight.
Realizing this it seems to make no difference what tumblers you have.. I have many machines some faster and slower than other. I took my slowest Machine " Craft- tool" loaded 200 30/06 and polished. This machine only turns 19-20 RPM. Within 4 hours Clean and polished. Taking My Thumler Hi Speed , The same results in the same time
I have encloses some Photo of my Craft tool and Others