I do tumble enough to clean, I just don't go for shiny. I tumbled, decapped (with a sizing die), annealed, trimmed, uniformed primer pockets and flash holes. Since I load on an AP, I ran them through the sizing die when priming and dropping powder. It is during this second pass through the sizing die that I suddenly started having stuck cases (6 in 200 rounds).
There is only about 5000 rounds through this die, and looking at it with a magnifier and bore light, I do not see anything like scratches or abrasion in the die.
I cross posted this on another forum and I believe they have diagnosed my problem. I never considered that lube could settle out...I have not been shaking much before lubing, I suspect all the lube has been used up from the bottle and its left with nothing but the light carrier (alcohol?) in the bottle.
I'll pick up a new bottle of Dillon and shake the he11 our of it before every use.
NRA Lifer / Member TSRA