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 Post subject: Primer compound temperature sensitivity
PostPosted: Fri Jan 29, 2021 3:57 pm 
Utility Grade

Joined: Tue Feb 18, 2020 5:49 am
Posts: 12
Powders more or less are temperature sensitive materials.
The lower the powder temperature the lower the initial velocity of a shotgun shell.

Does anyone have seen a study about primer (lead styphnate) compounds ?

This would be a very interesting test.
Primer at minus 22F (in a freezer) fast loading with powder (powder at room temperature) and initial velocity measurement with a known setup.

Does anyone have been made a test like this ?




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 Post subject: Re: Primer compound temperature sensitivity
PostPosted: Fri Jan 29, 2021 4:50 pm 
Presentation Grade

Joined: Tue May 03, 2011 1:25 pm
Posts: 507
Location: New Mexico
No, I don't know of a test myself, but I'm sure they have been done by govt and coml organizations in the past. IIRC, The results for lead styphnate primers were - no significant differences from "too cold to be out" up to "too hot not to be looking for shade and water."

Primers can cook-off at fully-automatic-firearm-chamber-temperatures, of course.

There are a few powders that have a reverse ambient-temperature-to-chamber-pressure relationship. A common one is Winchester Super Target, which exhibits higher chamber pressures at lower temperatures.

good luck, garrisonjoe


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 Post subject: Re: Primer compound temperature sensitivity
PostPosted: Fri Jan 29, 2021 5:34 pm 
Shotgun Expert
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Joined: Sat Sep 09, 2006 11:02 am
Posts: 27173
Location: Plainfield, IL
I wouldn't obsess over primers, as the specific propellant is far more of a factor as is the specific application.

https://www.gunsandammo.com/editorial/t ... ink/330463

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http://randywakeman.com/


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 Post subject: Re: Primer compound temperature sensitivity
PostPosted: Sun Jan 31, 2021 3:45 am 
Utility Grade

Joined: Tue Feb 18, 2020 5:49 am
Posts: 12
Thank you guys


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 Post subject: Re: Primer compound temperature sensitivity
PostPosted: Sun Jan 31, 2021 6:06 am 
Crown Grade

Joined: Sat Feb 05, 2005 4:51 pm
Posts: 10940
Location: Phoenixville PA
The military liked and used the chlorate (corrosive) primers for rifles (.30-'06 M-1s, BARs, etc.) until the late '50s. It was supposedly "stable" (whatever that means) from -20 to +120 deg. F.

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 Post subject: Re: Primer compound temperature sensitivity
PostPosted: Sun Jan 31, 2021 11:31 pm 
Crown Grade

Joined: Sun Mar 03, 2013 11:01 am
Posts: 6393
Location: Newton Kansas
RandyWakeman wrote:
I wouldn't obsess over primers, as the specific propellant is far more of a factor as is the specific application.

https://www.gunsandammo.com/editorial/t ... ink/330463

^^^^^^^^^^^^^^^^^^^ This.^^^^^^^^^^^^^^



US GI ammo went away from Chlorate primers in '52/'53, some foreign-made stuff continued on much later ('70's or '80's).



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I don't always venture out into the sub-freezing darkness, but when I do, it is hunting season, and I carry a Browning. Stay hungry my friends.


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