How did this happen?

[joken]

It rained Thursday so I was messing around in the shop. I was checking my supplies and equipment for Elk season, and when loading speed loaders, I found this. I fired my rifle twice within a couple of minutes last season, and the only thing that could have melted this is a hot barrel. I have never noticed the barrel getting hot or I would have noticed it when reloading, particularly if I was at the range. It's a mystery to me.

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[thorborg]

Maybe they are teeth marks from a powder junkie mouse that got in there and chewed on it.

 

[Andy54Hawken]

Hmmm...never had that issue with just shooting powder , patch and ball....you know the way Daniel Boone and Kit Carson did it.
Just kidding you...

The only time I have seen plastic melted like that with a black powder firearm was with some old , reused many times...
Plastic shotgun shells .
Turns out you can only reuse 'em so long...till they turn into "red spahetti " in your shotgun chamber...

Weird no matter what.
Andy

 

[ilikegunspdx]

It rained Thursday so I was messing around in the shop. I was checking my supplies and equipment for Elk season, and when loading speed loaders, I found this. I fired my rifle twice within a couple of minutes last season, and the only thing that could have melted this is a hot barrel. I have never noticed the barrel getting hot or I would have noticed it when reloading, particularly if I was at the range. It's a mystery to me.
View attachment 1480393

Hard to tell from the photo. Is it melted or smashed?

 

[Stomper]

Looks to me like the hull was particularly hot at the end and when extracted deformed that way as it cooled down……

either that or it's from a failed attempt and making a trench-art bong and you got too stoned and don't remember.

 

[sikhed]

A wild guess:
Many years ago, RCBS offered free replacement of their powder hopper/ charger's green plastic reservoir.
The nitroglycerin, present in most pistol powder, ate into (corroded?) the green plastic reservoir, softening it, embedding it with powder kernels, and making it a mess.
I got a replacement from them, and it's been fine since.

But black powder doesn't contain nitroglycerin.
Were you using a sub?