It is usually done when loading large amounts on a progressive press to get the case lube off afterwards. Contrary to what some may believe, manufacturers do in fact tumble loaded rounds. That is why new ammo is clean and shiny and not covered in case lube and dirty from running through the industrial type presses.
I am using the term tumble, like most people these days, meaning use in a vibratory cleaner. Although, I know of one manufacturer the actually used a large plastic cement type tumbler.
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Maybe I'll need to increase my bandwidth with my internet provider with all the apologies I'll have flooding in...
