popped primer csa vz58 sporter

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frankduf

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Hi,
I got my brand new sporter vz58 to the range today. i used sellier & bellot fmj bullet. i got at least 4 popped primer issue out of the first 20 rounds. i also got a light strike but i think this one was due to the extreme cold temp exposure (-20 celcius)

Do you think its an issue with the ammo or the firearm? i am interested what you think guys, i will also contact csa and sellier to know what they think about that.

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Is it boxer primed?

Some years back, I recall reading that various American commercial hunting ammo in.7.62×39 had this problem when fired in milsurp rifles.

The consensus was that the brass cased, boxer primed ammo use softer primers than the military stuff. Worked great in civilian rifles chambered in 763x39 (like the Ruger mini-30), but resulted in smashed primers in many.milsurp guns.

Seems like cold weather would mitigate the problem if it were related to extreme chamber pressures due to hot-loads.

I like the advice above. Try some milsurp ammo if ya got some.

Did you check the casings for any other deformities/ irregularities that might indicate excessive chamber pressures?
 
It makes sense. It's the opposite problem the mini 30 reportedly has. Guys install a heavier hammer spring to get surplus ammo to fire reliably in that. They dont always strike the military primers hard enough. So it makes sense that a military rifle design might smash the primer harder. Wouldnt have expected it to be that extreme though.

I was thinking about getting some commercial brass cased ammo to maybe try reloading some 7.62x39. This will be something to watch for.
 
How does the firing pin fit the hole in the bolt face? A poor fit can cause this.
Where did the little discs of primer go? If one sticks in the firing pin hole, a slamfire could result.

SKS and AK rifles have floating firing pins. Flat tipped firing pins and strong primer cups are used to prevent slamfires. The strong primer cups are why misfires occur when M43 ammunition is used in commercial rifles.
 
Remind me to never buy a vz58... any new modern gun that requires certain ammo is utter trash imo. Although this is the first ive heard of this problem honestly.
 
Boris Badinov said:
Is it boxer primed?

Some years back, I recall reading that various American commercial hunting ammo in.7.62×39 had this problem when fired in milsurp rifles.

The consensus was that the brass cased, boxer primed ammo use softer primers than the military stuff. Worked great in civilian rifles chambered in 763x39 (like the Ruger mini-30), but resulted in smashed primers in many.milsurp guns.

Seems like cold weather would mitigate the problem if it were related to extreme chamber pressures due to hot-loads.

I like the advice above. Try some milsurp ammo if ya got some.

Did you check the casings for any other deformities/ irregularities that might indicate excessive chamber pressures?
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^ this above. and take a magnifying glass and check the end of your firing pin to see if it's pointed as in it was made wrong. then do as others have suggested pick up some Barnaul ammo and see what happens. also the PPU is good ammo . try the Barnaul first and if the firing pin still punches through the primers then you have a problem . if I'm not mistaken Gasses can exit out the back of the receiver when you pierce a primer and it's not a good thing . use other ammo with mil spec primers.
 
rimlick said:
Remind me to never buy a vz58... any new modern gun that requires certain ammo is utter trash imo. Although this is the first ive heard of this problem honestly.
Click to expand...

It's a 60 year old design at least, I dont know if that would be considered modern. Its one of the most reliable and well made semi autos on the canadian market, especially NR. Lots of guns are picky about ammo. You just have to know what it likes/ what it's designed for, and use it.
 
definately the worst and unusefull comment! This gun is by far the best 7.62 i shot and by far the best quality made. Also CSA has a nice support. they told me this: Good morning,

We do check all the bolts on firing pin protrusion, so in theory, we should be good. However, I suggest you try some other ammo brand and see if same happens with let´s say Federal. If the same happens with other brands, it would be us. But since you have even one light primer strike, which is exact opposite of excessive protrusion which would perforate the primers, my bet would be that it´s ammo - faulty primers, or primers not suitable for these temperatures.

But we will know more when you compare the results with other brand. Let me know the outcome, please.

Thank you for buying our products.


So i am waiting to get Barnaul milspec ammo and try it out. If the ammo is the issue maybe i will have to reduce the fireing pin spring to hit less hard so i can continue shooting my favorite ammo. S&B as always been good on my sks and its very accurate and the fact its brass cased it wins all the way over other brand in my opinion
 
I realize these look like pierced primers, but I don't believe that's the case.

I'm going with blanking the primers. It's the opposite. It's when the firing pin has enough energy to ignite the primer but not enough energy to support the primer.

It does both.

I'm going with too much or too thick lube on the firing pin, hammer pivot combined with cold is slowing down the hammer.

Look at the inverted primer dent in one of the casings in the box.. bottom row, fourth to the right.

The extrusion ring around the dimples on all the cases, combined with the inverted dimple on the one is a clear indicator in my opinion.

Try degreasing/oiling, run the firing pin and hammer dry and see what happens.

This is quite common in the cold. One of the reasons they run their guns dry up north. Misfires and blanking.
 
tiriaq said:
How does the firing pin fit the hole in the bolt face? A poor fit can cause this.
Where did the little discs of primer go? If one sticks in the firing pin hole, a slamfire could result.

SKS and AK rifles have floating firing pins. Flat tipped firing pins and strong primer cups are used to prevent slamfires. The strong primer cups are why misfires occur when M43 ammunition is used in commercial rifles.
Click to expand...

This.

I see a lot of cratering on the other cases in your box? Brass is flowing back into the firing pin channel under pressure there, looks like
 
I went back to the range today, great wheater! +5celcius. I can now confirm one thing, sellier&bellot is a great quality bullet, but definately cannot be shooted in the vz58. Primer is too soft. I shot 40 round of barnaul without any issue. This amlo seems the best for the vz. Got nice group and real reliable
 
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