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powder that might be too moist

Any kind of propellant + microwave appliance 'processing' will get you a Darwin Award.

Alternative plan:

Buy yourself a 5-gallon 'big box' bucket & lid and a package of DampRid.

Open your 1 lb. containers of 'too moist' powder and DampRid, then place both into the bucket. Seal with the bucket lid.

(And if by reading this you think I mean to have you dump both propellant and dessicant into that bucket - together - there's nothing more I can add to this saga....)

Three or four days left undisturbed ought to do the trick. 8#'rs may take ten to fourteen days.
 
I am not sure if powder absorbs moisture all that well, but I could be wrong. I once had a useless amount of powder left over, so I tossed it in the toilet and was going to flush it. I let it sit for quite a while, but it kept floating, not really seeming to get darker or heavier and sinking. Maybe that does not tell much, I don't know.

Danny
Probably correct. I threw a lot of it into the front yard as a fertilizer. It took a week before it broke down with water everyday. Grass loved it though.
 
Probably correct. I threw a lot of it into the front yard as a fertilizer. It took a week before it broke down with water everyday. Grass loved it though.

Normally I toss any in the yard, too, but this was in the dead of winter, late at night, during subzero temps. I really didn't want to be going outside.

Danny
 
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I have seen warnings about vacuuming powder, as well.

Danny
I don't know about powder but I can confirm primers will ignite from static in a vaccuum. And if the primers go off in same vicinity as powder in the vaccuum, well you may need a new vaccuum if not a new house...
 
Just a note: We have been reloading smokeless powder for well over 100 years and moisture absorption has never been a problem. I have known folks who keep their presses set-up continuously, with powder in the measure, and never had a problem. If they are OK, your powder, in the powder company's jug, will be OK.
Finally, if you do have a worry--contact the powder company and talk to them. They know virtually everything about their powder.
 
In 2 Precision Shooting magazines in 2011 there was a question about getting humidity in your powder. One cause is leaving powder in your powder measure overnight as power is hygroscopic . Powder uses energy to burn off the water and that takes away energy from pushing your bullet out of the case. The speaker was a retired gentleman who worked for 30 years in a gunpowder manufacturing plant (unnamed). He forgot mention a microwave in the article.
 
The "cook off" temp is about 400* for powder. Just for general info, I was involved in an accident investigation involving ammunition and a hot gun.
 

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