Blanked my 1st Primer Today

[6.5 forever]

Bushing the firing pin is noted. Suggestions please on a proven smith?

 

[Old Navy]

Bushing the firing pin is noted. Suggestions please on a proven smith?

Carlsbad on this forum. Good price, quality work and fast turn around.

 

[Dgd6mm]

Already mentioned Carlsbad, Grimstod is also on the forum, Gre-Tan rifles.

 

[muleystalker]

Im an old shooter is a blanked primer what we used to call a pierced primer? Doug

You got it Sir.

 

[hoz53]

CCI 400 and Win Small rifle will blank on over size firing pin holes in the bolt.

Easy fix is thick cup primers IF you could get your hands on them. Other primers in the box fired indicate that the firing pin hole is large...source of the problem.

Now, the blank does go somewhere. I have had them end up in the bolt race way, Trigger group, and down inside the bolt which will make a shallow firing pin protrusion.

Hi keith— i do have some cci 450 and 41s. havent found the blank yet but i felt something on my cheek when i fired that round(i know thats not the blank) ill bush this one.

Thats a pretty stout load in the other post if its a 223

 

[AckleymanII]

Yes, Hoz it is a stout load, and very accurate, and also not for AR's.

 

[hoz53]

Yes, Hoz it is a stout load, and very accurate, and also not for AR's.

 

[hoz53]

Just talking out loud here, certainly not an expert.

So what I see in the pic is cratering of the pin strike with little to no flattening of the primer along the edges.
That doesn't sound like a really hot load, but each gun is different, for sure. So either a warm but not hot load, or, FP hole needs bushed, or, both. I am not speaking from experience here but my $.02 says bush the bolt. There's no down side to it.

I also see that the blanked primer shows more flattening along the edges than the other rounds.

My logic tells me that if the load was hot enough to cause that, all other things being equal, the other primers would have been flattened more. Would love to see a pic of a primer seated from an unfired round in the same batch?

Opposite side of the coin is this is a light strike. Maybe trash in the bolt?

What happens when you seat deeper with the same load? Did previous rounds show this in any way, even if slighter?

Again, just rambling on.....

Hope you post your results.

there were 25 loads initially- fired 6 yesterday (one blanked) and 19 today. the 19 today after i pulled the bullets from them, dumped charges, recharged with .9 grain less powder and seated new bullets a little deeper than the originals. forgot chrono battery yesterday but these today showed around 3280 so i really wonder what the first loads would have been. i have checked the bolt and will check FP spring soon and install new one. didnt read your post in time or i would have taken a pic of an unfired one. these are 2nd fired and so pockets are kind of tite. i used a lee auto prime to seat them and i thought they all bottomed. ill bush this bolt. no problems with the last 19. ill be updating the original post. thanks

 

[hoz53]

Have you by chance replaced the firing pin spring?

Frank

gonna do that soon

 

[hoz53]

Sometimes hot load is a misnomer. Pressures are moderate and other factors are the problem. I see a large diameter firing pin hole with an ill fitting firing pin that probably has the wrong shape on the tip. Pressure is measured in pounds per square inch. The larger hole diameter applies more pressure on the cup. Add an ill fitting pin and problems like this happen. The firing pin spring rate has little to nothing to do with blanking primers. We don't pierce them. They are blanked much like a punch press stamping out discs.

Good info — thanks Dave

 

[hoz53]

Needs trigger work.
Needs new firing pin spring.
Needs firing pin bushed.
Funny how LOTS of folks want to spend YOUR $$$.

First thought? Shoulder pushed back too far, (just enough to cause this issue) case a little loose in the chamber because of the shoulder position, firing pin pushes case forward in the chamber, primer tried to back out of the pocket when fired and gets "blanked".

You were on the bright track with the bullets into the lands.
If the case will rechamber with very little resistance, neck size, reload and go shooting. It IS a learning game we're playing.

coulda been. —- these were at 003 bump. at least i thought so. i mentioned the bullets into the lands because i knew that causes a little higher pressure and i probably i didnt work these up like i should have. thanks

 

[hoz53]

If is your first one, in how many ? could have been just the one primer cup was softer or thinner than others.
Wait and see if you get another one, before you go chasing the old dog tail.

many 1000s— you are right of coarse. thanks

 

[AckleymanII]

Take the firing pin out of the bolt, look inside down at the bottom with a small flash light or better yet, a bore scope. Those little pieces of primer get pounded flat as the firing pin falls..

 

[NorCalMikie]

"And there’s nothing wrong with being in the lands IF your load is adjusted accordingly and everything about the rifle is correct. Plenty of rifles shoot incredibly well that way"

I started out with ZERO free bore and bullets INTO the lands by about .010.
Lightest bullets I can get mt hands on and go heavier as the throat wears and it will, sometimes sooner than expected.
A given load, same powder charge, same bullet weight at some point will start to show pressure signs.
That same exact load with the bullet jammed INTO the lands will go beyond the pressure sign point with no issues.
Open the bolt on a live round jammed into the lands and you'll get a mess.
Know what to expect so rig is pointed UP so the powder stays out of the bolt lugs. We learn as we go.

 

[butchlambert]

It appears to be a headspace problem that is blanking his primers. piercing???

 

[NorCalMikie]

It appears to be a headspace problem that is blanking his primers. piercing???

Not a mechanical (chamber) head space problem. Comes down to brass sizing, shoulders pushed back just a little too far so the case moves in the chamber. Once case is fire formed, issue goes away till the shoulders get pushed back again, "too far" and you're right back where you were before.

 

[butchlambert]

Not a mechanical (chamber) head space problem. Comes down to brass sizing, shoulders pushed back just a little too far so the case moves in the chamber. Once case is fire formed, issue goes away till the shoulders get pushed back again, "too far" and you're right back where you were before.

I guess your explanation went over my head.

 

[Longtrain]

CCI400’s are a bit thinner then BR4’s, 41’s or 450’s, so if the load is a little stiff, pierced primers are possible.

 

[LCazador]

many 1000s— you are right of coarse. thanks

Has all of this brass been fireformed previously in your rifle not once fired in another rifle?

 

[hoz53]

Has all of this brass been fireformed previously in your rifle not once fired in another rifle?

yes - this was second firing of this brass in this rifle—