Fired my first reloads, but found something...

[TrickyDick]

Today I fired 36 reloads, between 2 rifles, 18 in each. Results weren't stellar, but I am sure that was my fault. (the first round of each load was a bit scary) but after it was said and done, I came across a pierced primer (WIN LR) it was a clean piercing, no marring whatsoever, and was on just a single round.... thin primer, or not seated deep enough?



Sorry for the crappy pic, but it was a cellphone.

 

[arizona98tj]

Can't tell from your self-admitted crappy pic what you were loading. Providing some loading information would be helpful...powder, charge weight, bullet weight, brass origin, etc?

 

[TrickyDick]

7.62x54R, IMR-4064, 45gr, 150 gr spitzer SP bullet, Win LR primer, COAL 3.03" +/- .002"

 

[Tolkachi Robotnik]

Even the other looks deep.

You may have a robust firing pin extension. It is true a lot of surplus and Eastern Block loaded ammo has recessed primers for this round. Did you inspect bolt face? It may burn it up a little if this has been happening much.

Are you shooting this from VEPR, it may shoot from 'open bolt'. That would put some pressure on things. Something to watch closely.

 

[TrickyDick]

It is true a lot of surplus and Eastern Block loaded ammo has recessed primers for this round.

These are handloads in Privi Brass. They were fired from a PSL. It was just one primer, that was a Winchester primer.

 

[stubbicatt]

Frankly I would double check firing pin protrusion on your rifle, perhaps have the tip of the pin reduced and then re hardened. That load near the top of the charts? I remember looking for some data for 200 grain x54r bullets, and IIRC 40 grains was listed as max load for that combo, so I wonder whether the load mightn't be a bit stout?

Another option is to buy some of the Tula military primers with the hardened cups to prevent this sort of thing from happening. I would suggest CCI 7.62 NATO primers, but my understanding of those primers is that the cup is the same as standard primers, only the anvil shape has been changed a skosh, so they might not present a clear solution to the comparatively long firing pin protrusion your rifle seems to present.

 

[TrickyDick]

The brass takes standard boxer primers. every other case is normal, so firing pin protrusion is unlikely. from what it looks like, is just a thin primer.

 

[243winxb]

Pierced or Blanked Primers 223 photo posted

Pierced or Blanked Primers. -------------------------------------------------------------------------------- 1. Check the firing pin, it should have no gas cutting or deformities. 2. Firing pin protrusion should be checked. Internet search shows .055" to be about right for an AR15. Check with a gun smith as each firearm IS different. 3.The firing pin must stay in contact with the primer on firing. A weak hammer spring on an AR or a weak firing pin spring like on a Rem 700 bolt action will let the firing pin rebound on primer piercing when the hot gas pushes the pin backwards. 4.If the hole the pin sits in is to larger in diameter, the primer flowes back into this hole till the center of the primer separates and fall into the action or travels into the firing pin area. Bushing the firing pin hole will fix this. Or you may want to try a magnum primer with a thicker cup. Military ammo may have a crimp that needs to be removed before seating a new primer. The crimp is removed by reaming or swaging the primer pocket. Swaging may be needed here so the prime can be seated lower in the pocket. High primer = misfires & pierced primers. There is also a high pressure sign visible. The reloader was using a "starting" load and CCI 400 primers. The CCI 400 is thin & soft, change to a mag. or Rem. 7 1/2 primers. The pressure sign may have formed on firing the factory ammo. I just shot some XM193F factory, the web area expanded .0015" on firing. This is a sigh of a "hot" load.

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