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Cracked Primers (Read 1717 times)

fallingblock ASSRA Board Member Online Posts: 633 Location: Wisconsin Joined: Apr 16^th, 2004	Cracked Primers Sep 9^th, 2023 at 7:03pm	Print Post
	Had several of these today any idea. Mine idea is a bad lot of primers. Cheers, Laurie

	Cheers, Laurie ASSRA Secretary & Archivist
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Tom_Trevor assra life no.71 Oldtimer Offline Tom Trevor Posts: 687 Location: Granada Hills Ca. Joined: Jun 16^th, 2004	Re: Cracked Primers Reply #1 - Sep 9^th, 2023 at 8:41pm	Print Post
	laurie, What manufacturer? Rifle or pistol?


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uscra112 Frequent Elocutionist Offline Posts: 4079 Location: Switzerland of Ohio Joined: May 7^th, 2007	Re: Cracked Primers Reply #2 - Sep 9^th, 2023 at 8:46pm	Print Post
	At .25-20 pressures, yeah, I'd say defective primer cup.

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fallingblock ASSRA Board Member Online Posts: 633 Location: Wisconsin Joined: Apr 16^th, 2004	Re: Cracked Primers Reply #3 - Sep 9^th, 2023 at 9:51pm	Print Post
	Federal Match small rifle. I dad a few cases before that had a little blackening but didn't notice the crack in the primer till today. Cheers, Laurie

	Cheers, Laurie ASSRA Secretary & Archivist
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Flatlander Oldtimer Online Posts: 599 Location: Warm Arizona Joined: Apr 24^th, 2004	Re: Cracked Primers Reply #4 - Sep 9^th, 2023 at 10:56pm	Print Post
	Newly manufactured primers or old stock? Flatlander

	NRA Life ASSRA Member 3197 Charcoal Burner
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Cbashooter Frequent Elocutionist Offline Posts: 1567 Location: Eastern Wa. Joined: Mar 31^st, 2018	Re: Cracked Primers Reply #5 - Sep 9^th, 2023 at 11:04pm	Print Post
	what was the load?


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fallingblock ASSRA Board Member Online Posts: 633 Location: Wisconsin Joined: Apr 16^th, 2004	Re: Cracked Primers Reply #6 - Sep 10^th, 2023 at 12:31am	Print Post
	Reasonably new about 5 years old. I use 1970s RWS primers with no issues with the same load H 4227 10gr. Cheers, Laurie

	Cheers, Laurie ASSRA Secretary & Archivist
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SchwarzStock Frequent Elocutionist Offline Posts: 1122 Location: SchwarzWald Joined: Mar 23^rd, 2010	Re: Cracked Primers Reply #7 - Sep 10^th, 2023 at 7:33am	Print Post
	Primer pockets are tight?

	If your rifle is not in 7.62 and you can't hit what you are aiming at with de-linked machinegun ammo you are a pretender.
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TomKlinger Junior Member Offline Posts: 71 Joined: Feb 17^th, 2019	Re: Cracked Primers Reply #8 - Sep 10^th, 2023 at 7:36am	Print Post
	Have you checked your breech block for signs of gas cutting? Tom


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MikeK Participating Member Offline Posts: 34 Location: Northern Virginia Joined: Jul 21^st, 2018	Re: Cracked Primers Reply #9 - Sep 11^th, 2023 at 11:25pm	Print Post
	Had the same thing happen with one of my silhouette pistols, an MOA in 7MM Bench Rest. Primers were CCI BR4. Looked just like your photo. Caused a few burned spots on the breech block from gas cutting. It only happened with primers from one box of 100. The primers otherwise looked normal, ie, no excess pressure signs. Mike


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steveu Junior Member Offline Posts: 51 Joined: Aug 21^st, 2023	Re: Cracked Primers Reply #10 - Sep 11^th, 2023 at 11:35pm	Print Post
	I had the same thing with Remington small rifle primers in the 90’s. I called them and they replaced the primers and the cost of 2 ar15 bolts that were gas cut. The engineer told me that the cups had a defect in them causing a weak spot which allowed the pressure to leak out. Cheers, Steve


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craigster Oldtimer Offline Posts: 673 Location: lost coast CA Joined: Feb 20^th, 2011	Re: Cracked Primers Reply #11 - Sep 11^th, 2023 at 11:36pm	Print Post
	Winchester had the same problem with some of their primers a few years back. Messed up the bolt face on one of the nicer rifles I have.


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wesg Senior Forum Member Offline Posts: 267 Joined: Sep 13^th, 2004	Re: Cracked Primers Reply #12 - Sep 12^th, 2023 at 12:04am	Print Post
	They're 'drawn' from stock cut ... "slit" from wide coils. A defect in the material somewhere in the wide roll they started with will leave cracks where the cup is formed to the sides. I made dies forming rectangular cups with a flange on the top. Stainless steel, ran millions of the damn things. Every once in awhile we'd get a coil that would crack. Yank it out, put the next one in off the pallet and everything would be fine for the next 100k parts. I had a brand new die making the most perfect parts I'd seen. And after the first coil I had to pull it out and tweak it back to ugly to get the remaining material to make 'good' parts ... Grrrrrrrr ....


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tim_s Oldtimer Offline Posts: 815 Location: 13066 Joined: Oct 11^th, 2006	Re: Cracked Primers Reply #13 - Sep 12^th, 2023 at 4:35pm	Print Post
	I suspect they may be older. That said, they will cut a nice radius around your firing pin. 205M’s some time back had this issue, thought to be error in swaging the cups. I actually had Federal replace the primers on a BR rifle. Not going to be a safety issue but you will get more flame cutting.
	« Last Edit: Sep 12^th, 2023 at 6:37pm by tim_s »
	“ I don’t have to be faster than the bear, I just have to be faster than you”
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Premod70 Oldtimer Offline Posts: 864 Location: North Carolina Joined: Jan 16^th, 2016	Re: Cracked Primers Reply #14 - Sep 12^th, 2023 at 5:59pm	Print Post
	Definitely throw those primers away and check the breechface for possible damage. Good luck.


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