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Hot Topic (More than 10 Replies) Light primer strikes (Read 2989 times)
Arty5715
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Light primer strikes
Mar 9th, 2022 at 9:31am
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Haenel Aydt rifle in firing condition. Primers are struck very light, ammo is reformed 38/55 cases. Would seem the primer may be set low in the pocket. Same ammo works fine in my Mauser Wehrmannsgewehr. Anyone else have the problem with a Haenel?
  
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westerner
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Re: Light primer strikes
Reply #1 - Mar 9th, 2022 at 9:57am
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Yes. Could be a weak mainspring. If nothing is dirty binding or rubbing where it shouldn't be rubbing I would suspect the mainspring. The Aydt achilles heel.
Primers seem low? They are either low or not low. Should still fire the round.
  
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Dellet
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Re: Light primer strikes
Reply #2 - Mar 9th, 2022 at 10:40am
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Did this problem just start with new brass? Or is this a new rifle you have never shot?

Knowing the primer you are using might help. Some are known to be tougher to set off.

If it’s new to you, it would be worth checking headspace. 
Use an empty case, seat a primer .015” or so high, carefully close the action, remove the case and measure how high the primer sits.’

Would not hurt to check how far the firing pin sticks out. But that’s pretty far down the list of possibles.
  
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oneatatime
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Re: Light primer strikes
Reply #3 - Mar 9th, 2022 at 11:12am
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If it is an 8.15x46R, I only use LP primers in my target loads. Put one in a case and try it. Yes, it will be low in the pocket but I'd bet the firing pin (hammer!) will find it.
  
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Fred Boulton
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Re: Light primer strikes
Reply #4 - Mar 9th, 2022 at 11:59am
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One of my 8.15 rifle suffered from this problem. The hammer in most German rifles come to rest against a positive stop---not just stopped by the firing pin on the primer. I stripped mine down and lightly stoned the contact faced---I probably didn't take more than a coule of thou off in total but it cured the problem.
Fred
This one:
  
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4060may
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Re: Light primer strikes
Reply #5 - Mar 9th, 2022 at 4:28pm
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I had an AYDT in 8.15x46r, if the rim is too thick it took two hits to set off the primer
check the rim thickness, should be .052-.054
  
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JLouis
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Re: Light primer strikes
Reply #6 - Mar 9th, 2022 at 6:13pm
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And the primer pocket maximum depth and the firing pin protrusion and it should be 54 to 60 thousandths.
Below is a Link to the minimum and maximum primer pocket depths.

(You need to Login or Register to view media files and links)
  
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Arty5715
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Re: Light primer strikes
Reply #7 - Mar 11th, 2022 at 8:50am
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Thanks for the insights!
  
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Mick B
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Re: Light primer strikes
Reply #8 - Mar 11th, 2022 at 6:07pm
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I had a similar problem problem with my CPA Stevens using large magnum pistol primers which are a little shorter than rifle primers and seated too deep for consistent ignition. Seating the primers through paper solved the problem and cost nothing to do, worth a try at least.
Mike.
  
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JLouis
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Re: Light primer strikes
Reply #9 - Mar 11th, 2022 at 8:18pm
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Mick B by chance is this still old enough to being prior to CPA enlarging the nose of the firing pin for free?
Just curious because prior to the firing pins would quit regularly break and the rifle would still fire. 
I know the current issue is not one of your own but hopefully the OP can take a look to see if the nose of his might be broke and why I bring it up.
After I sent three of my CPA breech blocks to CPA for the free up grade I have not lost one since. But prior too they would break quite often and often  times in the middle of a match. 
  
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gwahir
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Re: Light primer strikes
Reply #10 - Mar 11th, 2022 at 9:01pm
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I am interested in knowing how large CPA made the pin tip if not too much hassle..
  
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JLouis
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Re: Light primer strikes
Reply #11 - Mar 11th, 2022 at 10:13pm
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Let me get back to you I have company right now. 
I believe I still have both in my spare parts bag so I might actually be able to share the before and the current..
  
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gwahir
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Re: Light primer strikes
Reply #12 - Mar 12th, 2022 at 9:11am
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About primer strikes; excess firing pin protrusion decreases the distance, and time, the pin will move before it contacts the primer. This is not good.The strike is powered by a spring and the strike is harder if the spring has more time to work - overcoming momentum and getting everything moving. The pin should protrude only far enough to push the surface of the primer against the anvil.
« Last Edit: Mar 13th, 2022 at 11:05am by gwahir »  
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JLouis
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Re: Light primer strikes
Reply #13 - Mar 12th, 2022 at 9:46am
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Gwahir the original CPA firing pin nose diameter is .062 and this was upgraded to .080.
  
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gwahir
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Re: Light primer strikes
Reply #14 - Mar 12th, 2022 at 4:21pm
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.08" would do well for lower pressure. Makes sense.
  
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