Old powder

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It's my understanding that if it has a coating on the outside to slow down the burn rate, it would be the first to go, that the burn rate would increase, not to mention if the size was reduced due to deterioration that the burn rate would also increase.

This can of IMR 3031 is the first can I've run into that had rust in it. All my paper can powders (Hercules) is just fine. So I really don't have first hand experience with bad powder. I'm learning here also.

I will have to look at the IMR3031 under a magnifying glass to see if the sticks are actually compromised.

I've read to many times that when powder breaks down it releases Nitric acid and that starts the metal in the can to rust. it's supposed to be the first sign.
I would think it could speed up or slow down the burn rate depending on what kind of powder, single or double base, coated or not coated, flake, stick, or ball, etc.
 

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Slamfire1; That looks like some of the rounds I salvaged for components only 8mm from 1937. Most bullets were OK with cleaning. Everything else was scrap. Got 8 pounds of powder out of them. Dumped powder in cardboard box and lit it off Sight to see, flames 30 to 40 feet in the air.
 
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