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Powder sticking to inside of case wall

Pulling the bullets of some 300 win mag brass that had I loaded up 5 years ago and I am finding that the powder is sticking to the side of the case wall after pulling the bullets. Loaded with AA3100 and 180 Nosler Partitions. I have never had this happen before. Any clue why it would happen? Thx in advance.
 
No. It was a compacted load, but I never have seen sticks of powder stick individually to the wall. I will vibratory clean to make sure it's all out.

If you're certain it was not a lubricant issue, the only other possibility I can think of is a moisture issue when the cartridges were reloaded.
 
‘Rotten’ powder …? Powder look and/or smell weird …? What were the environmental conditions during storage?
 
My understanding of neck tension and the lapse of time, and now this powder event leads me to believe I need an expiration date on my loads to go long range.
 
Pulling the bullets of some 300 win mag brass that had I loaded up 5 years ago and I am finding that the powder is sticking to the side of the case wall after pulling the bullets. Loaded with AA3100 and 180 Nosler Partitions. I have never had this happen before. Any clue why it would happen? Thx in advance.

Powder deterioration? Does it smell bad?
 
I store all my powders in the same location, for the last 20 years. I have never had this situation arise before. Anything is possible though.
Powder deterioration? Does it smell bad?
Smells ok. I have changed my methods over the years. I was using Hornaday spray lube for a time. Maybe that's the culprit.
 
If you're certain it was not a lubricant issue, the only other possibility I can think of is a moisture issue when the cartridges were reloaded.
I pulled 20 rounds of new factory ammo
To get the brass for a load I wanted to
Try ,it was a compressed load also.the powder was stuck to the inside of the
case in this also . It was Federal fusion
150 grain 7 wsm ammo
 
I've found the same thing with compacted loads of N550 that have been loaded for a time.

+1 on John's post. I bought a 6ppc off a fellow that had loaded 100 rounds about 3 years before I bought it. When I pulled the bullets, I found the same thing the OP found powder stuck to the walls of the case and the powder would not reliably come out of the case. So of course I was obliged to shoot those rounds rather than take a chance of not getting all the powder out of some of them by trying to tap and pick it out. Those rounds had N133 in them and were stored inside a very comfortable home. JME. WD
 
I just had a similar experience after using Hornady One-Shot. Aimed a bit downward and some lube ended up inside the cases. Not happening again, back to sizing wax.
 
Not at all unusual with compressed charges of large kernel extruded powders. I've pulled down more than a few .25-'06 rounds with compressed charges of AA3100 and had the same thing happen. There was nothing wrong with the powder and there was no lube in the cases.
 
I had the same thing happen about a year ago, myself. Newer lot of IMR 4350 compressed, brass SS tumbled after sizing, loads & powder stored indoors and cartridges broken down maybe 6 months after loading. I just wrote it off to a combination of powder compression along with the existing moisture content in the powder. The previous same loads had fired fine.
 
I also use One Shot for lube and I have seen this "sticking" before on my hand loads.
At the suggestion of a forum member I wash all my brass right before I load them.
A sink with hot tap water and a little Dawn for dishes, let soak for 10 minutes, rinse off well. roll them in your wife's good dish towels while she's not watching, lay them out flat in a big cake pan and place them in a preheated oven at 250F for 20 minutes.
I no longer have sticking powder issues.
 

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