Discussion in 'Handloading and Reloading' started by tink77, Jan 12, 2016.
Only necessary during sizing.
I don't like digging the media out of the hollow points so I tumble them after they are resized also.
tumbling loaded rounds?
Is that for cosmetic reasons only, or rather what is the point of tumbling loaded rounds? Does it help to stave off verdigris? Thanks.
Aside from the lube collecting dirt and assorted contaminants it can cause other slight problems. When a case fires it rapidly expands in the chamber and against the chamber walls. The friction prevents the brass case (or any cartridge case) from slamming full force against the bolt face. Will a lubricated case have the same friction as a non lubricated case? Also, as mentioned, the lube attracts contamination and we really don't want to spread contaminants around our chamber walls, not if we can avoid it anyway.
That continues to be largely myth.
Take a look at this article/analysis about 60% down the page for an analysis of a 50,000psi 243Win cartridge.
"Summary Table with Estimated and Measured Coefficients of Friction"
I'm not sure how much of the lubed case = dangerous bolt thrust concept is real, and how much is tradition. But this analysis (and the tests that are hyperlinked) would say it is relatively small (~4-6%). Countering that thrust increase is the reduced stress on the brass/case stretch
Shootsm there too much evidence to the contrary: from the relatively little energy adsorbed
by stretching a quarter millimeter of thin brass to meet the bolt face if the case does grab,
to the mountain of historical evidence contained in the cites/links in Post #12 above.
Slick cases... whether ultra clean & polished to mirror finish in a tumbler or with slight case lube
... are your friend.
Just My Take on it....
As a footnote, the brass I start with is relatively clean. I lube my brass and size it as a first step and in most cases it is full length sized. Next I inspect and trim making all my brass uniform. At this point I clean my brass running it through the tumbler and finish the final tumbling with some NuFinish car polish in the tumbler media. I remove the brass and strain it and inspect it, I also chamfer the necks. At this point I either bag it and label it or I start loading it. Works for me and has worked for a good number of years.
I used to worry about slick cases years ago, and while I am not in the lube the cases to shoot camp, I am in the a little bit of polish or lube left on cases isn't going to hurt a thing.
I want them clean, and not sticky with lube, but squeaky clean, down to fresh raw brass, just isn't necessary IMHO.
I tumble most rounds after loading with a final polish media not used to JUST clean brass. I have found 20-30 minutes works well and leaves a tarnish resistant slick coating on the rounds. I like Dillon Rapid polish and find cases "finalized" with a polish to be just perfect after 10 years. Frankford Arsenal brass polish dulls after just 3-4 years, esthetic implications only, not functional.
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