Cause of miss fires found

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superx10
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Joined: Wed Aug 19, 2015 9:32 am

Cause of miss fires found

#1 Postby superx10 » Sat Jun 05, 2021 4:48 pm

I recently have had a few miss fires with new Palma brass and CCI 450 primers and on taking the offending cases home and pushing the primers home hard with a foster press they then ignited.

Tim L
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Joined: Mon May 19, 2014 7:11 pm
Location: Townsville

Re: Cause of miss fires found

#2 Postby Tim L » Sat Jun 05, 2021 9:11 pm

Yep I think that issue is cause for more misfires than it's given credit.
I've recently noticed with both BR4s an S&Bs that the spider is proud of the primer cup. I can't say for sure if that means the spider isn't secure so i just make sure the primer is fully home in the primer pocket so it doesn't matter.

bolster55
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Joined: Tue Sep 16, 2008 10:46 pm
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Re: Cause of miss fires found

#3 Postby bolster55 » Sun Jun 06, 2021 8:05 am

Hello All
The anvil(what you call the spider), has to sit proud of the cup to stop premature ignition. When seating a primer it requires "feel" to know when the anvil is seated inside the cup and is contacting the medium at the bottom of the primer cup. I use a single "shot" primer seater, this gives you feel when seating the primer.
There been many articles written regarding primers, one German Salazar has an excellent article, plus Manly others.


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