Apollo wrote:I know we are getting off topic with the stainless pins tumblers since that is not what the OP's question was.
Then we talk about Brasso and Ammonia stripping copper out of brass cases.
But what of the idea that soft brass cases are being tossed around with satinless steel pins and how does that system polish..?? By removing not only the dirt and grime but how much brass do the stainless pins remove from a case.. ??
Just a thought..!!
I'd like to measure a case before and after very accurately and see if it's removing brass.
Pins remove no more or less case metal than any other method of tumbling. Given an average case life of 10-15 reloads you'll be scrapping the case long before tumbling has any impact. I[ve done the corn cob, the Ultrasonic and now the pin style of case cleaning and the pins are by far the best of the bunch. The only possible downside I can see using the rotary pin tumbler is having the cases banging into each other causing work hardening where as the vibratory method is less rough. I have noticed on the bigger cases that the lip can get out of shape or flattened a little which is why I chamfer & deburr post tumbling.
I'd have to ask why is the OP's brass so carbon encrusted to begin with? Maybe some other issue there, allowing a greater then usual amount of blowback. I've noticed that the sloppier the chamber the dirtier the brass, with the same load through 2 pistols, the Glock fired brass is dirtier then the Beretta.
How old is the brass? How many cycles? Neck sized or FLRS? Powder type? Load data? - Curious if others using similar loads have the same issues with carbon.