Question for wet SS pin tumbler users
I have used SS pins, dawn and a dash of citric acid for about two years and am very pleased with how well it cleans. I have noticed a new type of case failure not seen previously and wondered if anyone else has seen a similar type failure. I presently load for four long guns, in three calibers and cases are dedicated to each gun so it does not seem to be dependent on caliber or loading. I normally neck size only but when full length is used dies are set so shoulder is no more than .001 set back from fired case dimensions as measured with RCBS precision mike. I am getting circumferential cracks mid way between the base and shoulder after as little as three firings on some batches. They have developed in both commercial and military brass. The cracks are so small that a bent piano wire has to be sharpened to detect by feel. The cracks are mid way up the case walls and not even close to the head where I would normally expect them to be. Because the inside is so clean most are initially detected by looking through mouth of case. Pin cleaned brass is not as slick as dry tumbled brass and wondering if this could be a factor.