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Interesting Results for Brushing Necks

Doesnt the tumbling remove the carbon before annealing? When I tumble the carbon is removed making brushing unnecessary.
Wet tumbling with SS media will remove the carbon on the inside of the neck. Wet tumbling without SS media will remove very little of the carbon on the inside of the neck. Dry tumbling does not remove the carbon in the neck, or very little if any.

When someone just says they tumble their brass, it doesn't tell you much . . . does it? :rolleyes: ;)
 
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Sounds kind of odd but dry tumbling with rice and baking soda added works very good and as far as I can tell does not remove the carbon from inside the necks. It cleans the brass much better than the corn cob or walnut media or anything I've tried in the past with no clouds of dust from the tumbler at all.

EDIT: I do run a brush in and out (1 pass) of the necks once removed from the tumbler.
 
Sounds kind of odd but dry tumbling with rice and baking soda added works very good and as far as I can tell does not remove the carbon from inside the necks. It cleans the brass much better than the corn cob or walnut media or anything I've tried in the past with no clouds of dust from the tumbler at all.
I also dry tumble with rice, just rice alone, (medium grain size) and find it works quite well. Besides not having that dusts issue, the rice does leave a little bit of a lubricating coating behind in the neck that makes for nice bullet seating.
 
My procedure is to tumble, anneal, full length size w/bush., tumble, brush necks, dry lube necks, mandrel necks, seat primer, charge, seat bullet. I'm going to try moving "brush" before "anneal" on one stage of the next 3x20x1K yards match.
I would interested to see the results of not brushing at all. Leaving all the carbon.
 
Unfortunately, any of the variety of dry media currently being utilized, does leave a slight amount of "dust" on the brass.

Once I switched from dry media to SS pin wet tumbling, EVERYTHING is cleaner, including reloading equipment.
 
Just a guess but.... it different amts of carbon left, I'd expect different neck tensions, and as I understand it, that's bad. :)
Being curious about the carbon build up in the neck over a number of firings, I ran a test taking 5 once fired cases and measured the neck thickness over 7 more firings without cleaning the necks. I didn't not find any increase in neck thickness that I could measure. Along this line, any variation in the amount of carbon left after cleaning is going to be even less measurable.
 
Being curious about the carbon build up in the neck over a number of firings, I ran a test taking 5 once fired cases and measured the neck thickness over 7 more firings without cleaning the necks. I didn't not find any increase in neck thickness that I could measure. Along this line, any variation in the amount of carbon left after cleaning is going to be even less measurable.
i doubt you can measure what is being talked about...untill you get an AMP seater
 

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