Originally Posted by rl4930 View Post
Have any of you guys noticed the necks sometimes have a burr after tumbling, also having your extreme spread over the chrony greater with super clean necks vs. vibratory tumbled necks. ? I remember reading an article about it somewhere, and I think I have experienced it first hand, but I'm not 100% sure since my chrony is a POS.
The peening of the case mouth is caused by the cases hitting each other in the tumbler. The solution to this is complicated because it deals with the size of the tumbler, the shape of the drum, the speed the drum rotates, the size and amount of brass, and how much water is in the drum. I have the Thumler's Tumbler Model B High Speed, and now they sell three different models. So you have a mix of factory made and home made tumblers and you either follow the tumbling direction that came with your unit or make up your own tumbling rules.
Below on the left is a .223/5.56 case I tumbled "TOO LONG" and peened the case mouth, and it had been trimmed and chamfered the previous firing "AND" I did not follow the printed instructions. The case on the right is a brand new unfired Winchester case that had been dry tumbled in one of their giant tumblers. Also I'm 65 and have chronologically gifted eyesight and the case mouths didn't look that bad with the naked until I took these macro photos.
But there is a reason they make case trimmers and deburring tools.
And when all else fails read the directions.
#3, I wasn't weighing the brass and # 6 I fell asleep and the cases tumbled over 8 hours. I solved one problem by buying a cheap digital kitchen scale and weighing the cases, instead of throwing the brass in a coffee can and saying that looks about right.
And now super clean necks and bullet grip/neck tension, the clean necks and the bullet can bond together over time. And the bench rest shooters at Accurate Shooter who wet tumble, seat their bullets a little long and just before a match they will do the final bullet seating to break the bond.
If you wet tumble, chamfer the case mouth before you size the case and remove any burs or peening. (if your doing things right peening should never be an issue)
And below is what happens when you do not tumble your pins first to the remove the sharp ends of the pins. And fall asleep in the recliner and wake up with a stiff neck and a bunch of cases that had been chewed on by beavers.
Bottom line, wet tumbling is great when you follow the instruction, chamfer the case mouth and decide what method you are going to use about the inside of the case neck. Don't fall asleep and keep checking the tumbler to see if the cases are clean and work out your tumbling times.
And if you want to read the "War and Peace" length novel on the subject go the reloading forum at Accurate Shooter. Several engineers were involved and turned a simple subject into a engineering nightmare.
And now the really sad part, my older neighbor had a heart attack so I snow blow and shovel for him among other things . And his son is a local policeman and he keeps bringing me five gallon buckets of once fired .223/5.56 brass. Then my sons say "dads got more brass" and they buy 8 pound container of powder and bring it to me. It never ends.......
Cleaning Cases - Part 2: Wet Tumbling
http://www.massreloading.com/reloading_wet_tumbling.html
STM Tumbling Tips (or when all else fails read the directions or Google the subject)
Frequently Asked Questions
http://www.stainlesstumblingmedia.com/tips/
