Old March 26th, 2021, 12:52 PM #1
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What is the difference between

What is the difference between the 2 primers attached? They are both CCI non magnum large rifle primers. One is described as for a military cartridge. Does crimping a primer require a difference in the primer itself?
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Old March 26th, 2021, 01:04 PM #2
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I think the military style primer cups are generally harder, so softer firing pin strike from some sports style firearms won't detonate them. If used in machineguns the sportsmans style may fire too easily leading to accidental discharge. I may be wrong but that is my recollection.
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Old March 26th, 2021, 01:45 PM #3
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Many firearms have what is referred to as a floating firing pin. The firing pin is free to move back and forth in the bolt, there isnít a spring holding it back. The M1 Garand, M1 Carbine, M14, and the M16 series of firearms are good US examples. The AK series as well as the SKS firearms also have the same style of floating firing pin. The result is that when the bolt closes the firing pin can move forward and hit the primer. The problem is that if the primer cup is soft the round may go off. The problem is more likely with heavy firing pins.
The militaries specify harder primer cups to prevent soft firing pin hits causing problems.

As far as crimping goes. The military specifies a crimped primer just to make sure it stays put. And some primers are sealed to prevent water from affecting the ammo.
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Old March 26th, 2021, 05:01 PM #4
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So in these days of scarce primers, If I see these in stock at a reasonable price i'm a free to purchase and use the interchangeably. Both my 30-06 M1 and 308 AR10 have a floating firing pin. I did know that the only difference between large rifle and large pistol was rifle was a thicker cup metal, I didn't realize that military cups were thicker still
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Old March 26th, 2021, 05:09 PM #5
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Acually, there is a difference between large rifle and large pistol other than cup thickness. The large rifle primer is taller than the large pistol primer.

See this page for info:
https://ballistictools.com/articles/...d-diameter.php

There is no dimensional difference between small rifle and small pistol.
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Old March 26th, 2021, 05:28 PM #6
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Also, allegedly, the #34 primers have magnum priming mix.

Read here under product overview:
https://www.midwayusa.com/product/1301152162
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Old March 26th, 2021, 05:38 PM #7
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The #34 and #41 primers meet mil spec requirements. I am too tired to look the spec up.
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Old March 26th, 2021, 08:45 PM #8
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Quote:
Originally Posted by 454shooter View Post
Also, allegedly, the #34 primers have magnum priming mix.

Read here under product overview:
https://www.midwayusa.com/product/1301152162
This also. Functionally the #41 and #34 are magnum small and large rifle primers respectively in terms of heat/pressure and cup thickness. The anvil is spaced just a tiny bit further away on the mil primers than the magnum primers to make it just that much harder for a footing firing pin to dent the primer and set it off without it being an intentional strike.

In terms of load data, treat them the same as CCI magnums.

Large rifle and large pistol primers are a different height AND priming charge. They are really the same at all. You cannot interchange them.

You can interchange small rifle and small pistol. Though small pistol isnít likely to do well igniting a rifle charge as they arenít nearly as hot. Small rifle would lead to over pressure in a pistol load that was already on the edge (hotter than a magnum small pistol primer). Probably wouldnít need to reduce your charge by more than .1-.2gr.

Most pistols would set off a small rifle primer. A striker fired gun with a light striker spring or other gun with a particular light seat spring might not set one off as they are harder than small pistol magnum primers.
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Old March 27th, 2021, 12:26 AM #9
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some reading
http://www.sksboards.com/smf/index.php?topic=56422.0

and here basically the same...
https://www.snipershide.com/shooting...imers.6936610/


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Old March 27th, 2021, 06:00 AM #10
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Quote:
Originally Posted by Rockzilla View Post
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