Rusty coloured powder

A bit of a tangent but seeing guys say the same wrong thing repeatedly is a bit irritating.

Powder begins deteriorating as soon as it is made. The powder sitting properly stored in your home or shop is deteriorating right now, it's just doing it extremely slowly thanks to the addition of stabilizers. Heat is the number one cause of deterioration to the point of actual breakdown of the product.

YOU'RE splitting one minor hair off a gnat's butt.

Powder will deteriorate for all sorts of reasons, even if stored properly and of relatively recent manufacture.

Ganderite could explain this much better than I can.
 
I've got powder easily as old as half the members here. Shoot some reloads I made for my 375 rum, must be 20 yrs ago.

Do a workup, start low and work up. If you have a chronograph check it against newer 7828. Shoot it up, don't combine with newer powder, if that's possible. In the past I've combined same powders of different lots/packaging/vintages, into a large container. Shake it up, you now have one consistent lot, perhaps slower/faster than the original. This is literally how they create canister grade powders. ie: add xlbs of slow 7828 to a slightly fast thousands of lbs of fast 7828....vice versa.

Work up your new to you powder/loads.
 
I had a metal can that had a little rust color but smelled fine. Poured the powder onto paper towels and rolled it back and forth to remove the rust and put into new plastic container and labelled for said powder. No more rust in powder.
 
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