Pierced primer Question

[2railbank]

New 6.5x47 Lapua brass
CCI 450 primers
39.6 grains H4350
Kelby's Panda action
I shot 55 rounds on Saturday with no signs of
excessive pressure. Then 25 rounds on Sunday before
piercing a primer making the gun inoperable.
How did I pierce a primer using virgin brass?
No i did not full length resize the brass.

 

[Doug Beach]

I don’t see how the virginity of your brass would affect primer piercing either way.
Pressure, large diameter firing pins, and excessive clearance of the FP hole to the FP cause piercing.

 

[6.5 forever]

Brass had nothing to do with that...hmmm

 

[Lone Hunter]

What bullet are you using? What was the temperature difference between Saturday and Sunday ?

 

[Konocti's Wigwam]

New 6.5x47 Lapua brass
CCI 450 primers
39.6 grains H4350
Kelby's Panda action
I shot 55 rounds on Saturday with no signs of
excessive pressure. Then 25 rounds on Sunday before
piercing a primer making the gun inoperable.
How did I pierce a primer using virgin brass?
No i did not full length resize the brass.

In my experience, trusting virgin brass is a bad thing to do. I have seen virgin brass that doesn't fit the gauge, but does when it is run through a sizer. I have also seen that in cases where I turn the necks, the material starts to come off in different areas on the brass, telling me that the thickness of the case is not so consistent. There are a lot of factors involved, IMO. I don't find it to hurt me if I turn the necks down to the size that I know fits the case with the bullet inside. I have a couple cartridges that is possible to exceed that dimension after it is fired in the chamber.

Did the pierced primer destroy the firing pin? I don't understand how it made your rifle inoperable...was your bolt destroyed?

 

[markm87]

Are these new 450s? If so I'd be thinking it was a defective primer cup if you're weighing every charge.

Was the piercing immediately obvious with that hot gas leakage? Or did you notice it later?

 

[HTSmith]

In my experience, trusting virgin brass is a bad thing to do. I have seen virgin brass that doesn't fit the gauge, but does when it is run through a sizer. I have also seen that in cases where I turn the necks, the material starts to come off in different areas on the brass, telling me that the thickness of the case is not so consistent. There are a lot of factors involved, IMO. I don't find it to hurt me if I turn the necks down to the size that I know fits the case with the bullet inside. I have a couple cartridges that is possible to exceed that dimension after it is fired in the chamber.

Did the pierced primer destroy the firing pin? I don't understand how it made your rifle inoperable...was your bolt destroyed?

A blanked primer will often break a Jewell trigger if that’s what he had. The small piece of metal can lodge in the bolt body so as not to allow enough firing pin protrusion. Don’t ask me how I know these things

 

[gunsandgunsmithing]

New 6.5x47 Lapua brass
CCI 450 primers
39.6 grains H4350
Kelby's Panda action
I shot 55 rounds on Saturday with no signs of
excessive pressure. Then 25 rounds on Sunday before
piercing a primer making the gun inoperable.
How did I pierce a primer using virgin brass?
No i did not full length resize the brass.

Pics? Virgin brass can be short and excess headspace can be a contributing factor to cratering/piercing but is not typically the underlying cause. Clean bolt thoroughly inside and check or just replace the fp spring. If it still does it, call Kelblys or have someone bush the bolt. Pressure is another thing that can be a contributing factor but is not typically the underlying cause.

 

[2railbank]

New 6.5x47 Lapua brass
CCI 450 primers
39.6 grains H4350
Kelby's Panda action
I shot 55 rounds on Saturday with no signs of
excessive pressure. Then 25 rounds on Sunday before
piercing a primer making the gun inoperable.
How did I pierce a primer using virgin brass?
No i did not full length resize the brass.

Berger 140 hybrid
No large swing in temperature
The trigger stopped functioning.

 

[2railbank]

Berger 140 hybrid
No large swing in temperature
The trigger stopped functioning.

New box of primers

 

[gunsandgunsmithing]

Berger 140 hybrid
No large swing in temperature
The trigger stopped functioning.

Jewell trigger? What I think happens here is the gas pushes the firing pin all the way back and it breaks the trigger when it rebounds forward

 

[2railbank]

New box of primers

Jewell

New box of primers

Jewell trigger

 

[gunsandgunsmithing]

New box of primers

Possible but highly, highly unlikely the cause.

 

[J.D.Erwin]

Jewell

Jewell trigger

if you can remove the bolt do that and strip it down do a complete cleaning and check for fragments from the primer.

 

[Rank Amateur]

Trigger may not be broken. Debris from pierced primer can get caught in Jewell trigger causing binding. This can sometimes be cleared simply by running lighter fluid through the trigger. You can also dissassemble the trigger to clean it out, but I’ve cleared Jewell triggers numerous times without taking the barreled action out of the stock. Simply flushed lighter fluid through the trigger by running it over the sear through the top of the trigger, and then blowing it out with canned air. Sometimes pressing down on the sear a couple of times during/after flushing also helps clear out whatever is binding.

 

[misser]

did ya get the primers out ?

 

[searcher]

A blanked primer will often break a Jewell trigger if that’s what he had. The small piece of metal can lodge in the bolt body so as not to allow enough firing pin protrusion. Don’t ask me how I know these things

I love Jewells. I've also had foreign matter get into mine before and that is no bueno.

 

[JerkyFreak]

Photos of said case heads with pierced primers would be helpfull. So would photos of the firing pin and the hole in the bolt face.

 

[RegionRat]

Be interesting to hear what the inspection of the bolt and tear down has shown?

 

[2railbank]

Be interesting to hear what the inspection of the bolt and tear down has shown?

Be interesting to hear what the inspection of the bolt and tear down has shown

Be interesting to hear what the inspection of the bolt and tear down has shown?

Dropped gun off at Gunsmiths shop for evaluation. He is going to talk to Kelby's & atleast replace the bolt spring.
Thank you for everyones input.