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Old 03-02-2004, 10:22 AM
Rmouleart's Avatar
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Federal got back on the GM210M primers


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Hi a few weeks ago I posted a question on Federal GM210M primers, I noticed they were larger than the CCI's I usually use, and also noticed my bolt face was touching the primers face, and yes they were seated as far as they could be, also used once fired brass, primer pockets clean as well.
So here is what Mike Larson from Federal said. It only took him 2 weeks to get back

Hi RAMbo,
It could very well be that the assembled height of the Federal Gm210M primer is higher than a CCI primer. The fact that your bolt face is contacting the primer cup indicates that the primers are not being seated BELOW the case head. Primers must be seated below flush for safety reasons. It is possible for a high primer to detonate if the bolt face crushes the primer cup during chambering. The generally accepted method for proper primer seating is to seat the primer into the pocket so that the anvil legs lightly touch the bottom of the pocket, then apply just a touch more pressure. It is very important that any primer in any type of ammunition is seated below flush with the case head.
Thanks for contacting us.
Mike Larsen.
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Old 03-02-2004, 10:30 AM
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What's the primer pocket depth?
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Old 03-02-2004, 10:54 AM
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Mike I'm not sure what the depth is,due to I have no instrument to measure primer pocket depth at this time, Never before have I had a problem with primers or depth, but using my CCI's primers seat perfect, these were once fired winchester brass. Bye the way I did work that load,and the fed's worked very well, GM210M burn very clean as well, compared to the CCI's...Mike you may be right about the primer pocket being too small, I did inspect the original winchester primers that I deprimed from those 243win cases and the bottom of the primers were the firing pin hits was flattened some,when looking at the side profile, more than any of the other spent primers from past use from other carts.
RAMbo.

Last edited by Rmouleart; 03-02-2004 at 11:55 AM.
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Old 03-02-2004, 02:48 PM
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Do you have a caliper with a depth measurement? That will be accurate enough.....
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Old 03-02-2004, 03:37 PM
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A suggestion;
Get a primer pocket uniformers. This will cut the primer pocket down to the standard depth, true up the bottom of the primer pocket, as well as tell you that the primer pocket is shallow or not.
Jim
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Old 03-02-2004, 05:20 PM
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Mike, thats just what I did, I got .135 for a depth. RAMbo.
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Old 03-02-2004, 05:41 PM
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0.135" sounds plenty deep.... spec for large rifle is 0.128" - 0.132," per the information that came with my Midway primer pocket uniformer.

What's the difference in thickness between the CCI and Federal primers (assuming you still have some left)?

Diameter of primer pocket? Should be about 0.210," I believe......
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Old 03-02-2004, 08:32 PM
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Mike the Win 243 brass dia 0.200 wide, the Fed primer is 0.210
.130 Federal GM210M & CCI's LRP .125
RAMbo.

Last edited by Rmouleart; 03-03-2004 at 06:55 AM.
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