Exploded 50cal

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60south
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Exploded 50cal

Post by 60south » Wed Jul 01, 2020 5:16 pm

NWDC Hive Mind, we need your help.

We keep pulling up goofy things from Port Townsend Bay. The last dive included this spent 50cal casing that appears to have blown up!

The question is, under what circumstances would a cartridge blow up like this, where the casing is expanding outward? Does that imply that the whole barrel of the gun blew too?

That was probably a bad day for someone.
50cal_1.jpg
50cal_2.jpg
50cal_4.jpg

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RoxnDox
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Re: Exploded 50cal

Post by RoxnDox » Wed Jul 01, 2020 7:30 pm

My guess is that this damage pattern would also have required damage to the gun itself. If the firing chamber remained intact, the brass casing would not have had any place to blow out like that.
<Penopolypants> "I, for one, would welcome our new cowboy octopus overlords."
<LCF> "There is ALWAYS another day to dive, as long as you get home today."

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Desert Diver
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Re: Exploded 50cal

Post by Desert Diver » Thu Jul 02, 2020 9:34 pm

How would it get out of the chamber all expanded like that?

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RoxnDox
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Re: Exploded 50cal

Post by RoxnDox » Fri Jul 03, 2020 12:56 pm

Probably split the chamber and burst the breech end of the barrel... Someone could've picked it out of the wreckage or it may have 'escaped' on its own if the whole thing blew apart...
<Penopolypants> "I, for one, would welcome our new cowboy octopus overlords."
<LCF> "There is ALWAYS another day to dive, as long as you get home today."

Furnari
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Re: Exploded 50cal

Post by Furnari » Fri Jul 03, 2020 7:48 pm

With the struck primer, maybe it was a misfire that later burst in a fire? Hangfire that burst after extraction?

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Desert Diver
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Re: Exploded 50cal

Post by Desert Diver » Fri Jul 03, 2020 7:58 pm

After a closer look I am sure that this cartridge did not explode. One of the signs we watch for while reloading is flattened primers. This primer is not flattened.
http://www.larrywillis.com/pressure_signs.html

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