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Like Jimkin, I put masking tape on the outside of the powder measure, and note the caliber, bullet, powder charge, and OAL. I also have only one can of powder out at a time. I frequently load large quantities of ammo at a time over several days or weeks, and leave everything set up. I only remove double based powders from the measure mostly based on reports of others, but I've never had a problem with single based powders discoloring my measure hopper. Matter of fact, I think the ONLY powder that's ever discolored or etched any of my measures was Unique.
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