I have the STM case tumbler (rock tumbler) with stainless steel pins, I have seen the very small Cement mixer used with walnut media and they worked well. When walnut shells are used they act as a buffer in these type cleaners and dampen the cases hitting and colliding with each other.
With just water and stainless steel pins the cases hit and strike each other, in a normal size case tumbler and with stainless steel pins you can end up with the mouth of your cases being hit by the other cases. This hitting action will peen the case mouth and pound the heck out of your cases if too few cases are added to the tumbler and let tumble for too long.
Motor speed, drum size, the amount of cases and water play a part in cleaning efficiency.
What I see with using a cement mixer and stainless steel pins is a lot of damaged cases.
Below is what happens when you put too few cases in a standard tumbler and leave them in too long.
Below case mouth peening, and remember once the case is trimmed to length only trimming shorter removes the damage.
Below scratches on the case body.
With the naked eye you might not see above without a magnifying glass.
And the LemiShine adds the bling to the cases and makes them shine.
I used the case tumbler because I had three five gallon buckets of once fired .223/5.56 brass to clean and prep and just washing the cases wasn't good enough.
Google cement mixer case cleaning and then click on images and follow the photos to the related web pages, you will see a lot of people using walnut media to clean large amounts of cases with good results. BUT remember the blades or paddles are removed from these small cement mixers to prevent damaged cases.
