Blanked my 1st Primer Today

[hoz53]

finally blanked one—— I guess I have lived a mild life up to now. No ejector marks but there isnt an ejector in this gun. Rem 700 - .223 using CCI 400s. 26.9 H335. 52 SMK—- I did have them a bit into the lands. brought the remaining home and reduced my charge and seated them a little deeper. Sure wasnt gonna waste those primers. will see how these do tomorrow.

 

[muleystalker]

Check and clean that trigger and inspect inside of bolt.

EDIT: My reason for this comment was to check for damage and debris caused by pierced primer, not to infer that these things caused the pierced primer.
The cause was probably as a few others have suggested.... bolt needs to be bushed.

 

[Old Navy]

Might be time to bush the bolt.

 

[Ray123]

finally blanked one—— I guess I have lived a mild life up to now. No ejector marks but there isnt an ejector in this gun. Rem 700 - .223 using CCI 400s. 26.9 H335. 52 SMK—- I did have them a bit into the lands. brought the remaining home and reduced my charge and seated them a little deeper. Sure wasnt gonna waste those primers. will see how these do tomorrow.

I'd start with primers and reducing powder charge, by changing to thick cup .025 primers CCI 41, CCI BR-4, Rem 7 1/2, winchester #41 for 5.56...
If you are going to run the pressures on the top.
.1 grain over max, old Sierra manual, 1.3 gr over max Hornady manual, .4 over Max in Speer manual. The CCI 400 is NOT a thick cup primer more prone to blanking as pressures get on the higher side. SO Changing primers to heavy cup and .5 grain reduction in powder will probably solve your primer blanking problem....and have max velocity.

 

[hoz53]

I'd start with primers and reducing powder charge, by changing to thick cup .025 primers CCI 41, CCI BR-4, Rem 7 1/2, winchester #41 for 5.56...
If you are going to run the pressures on the top.
.1 grain over max, old Sierra manual, 1.3 gr over max Hornady manual, .4 over Max in Speer manual. The CCI 400 is NOT a thick cup primer more prone to blanking as pressures get on the higher side. SO Changing primers to heavy cup and .5 grain reduction in powder will probably solve your primer blanking problem....and have max velocity.

Im not in need of the max velocity, just looking for accuracy and that is the sierra accuracy load and not quite the max load in that book. nevertheless i know i was pushing it with these. didnt want to waste the primers so i pulled the bullets in remaining i had loaded and backed the charge off .9- also seated the new bullets a little deeper. i would use the thicker cup primers with these in the future for sure. got some cci 400s to use up though. Thanks

 

[Richard Jones]

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.

 

[fkimble@charter.net]

Have you by chance replaced the firing pin spring?

Frank

 

[6.5 forever]

Have you by chance replaced the firing pin spring?

Frank

Tubs spring was a improvement in my 700.

 

[DaveTooley]

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.

 

[NorCalMikie]

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.

 

[Bill K]

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.

 

[K22]

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.

I'm with Bill K on this one but in addition, having the firing pin bushed is a minimal effort / cost and worth considering after observing the pictures of the spent primers.

PS: Never saw the need to seat bullets into the lands.

 

[Doug Casner]

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

 

[gunsandgunsmithing]

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

Yes. The brass of the primer stretches and flows into the fp hole, around the pin tip, weakening the brass and creating cratered primers. If bad enough or if there is enough pressure, it fractures a tiny disc from the primer, which is then blanked or as you say, pierced. Technically, it isn't pierced at all, though.

 

[swd]

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

Edit, yes, see Mikes excellent explanation above.

The OP should take the FP assembly out and make sure the disk isn’t in bolt and it’s clean inside from the blowback.

If you blow the pic up you can see the ridge of primer flow around firing pin from the slop. If the headspace on your sized brass is good and the pin tip is smooth and not damaged then look at bushing the bolt. Remington bolts are notorious for sloppy pin fit.

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.

 

[Doug Casner]

Ive had rifles do that and just toned the load down a little and fixed it. I had a franchi 20 guage that would do it so bad Id get a misfire. Got rid of the problem traded for a remington 1100 . Fixed it. Doug

 

[DaveTooley]

I just remembered having several Remington rifles in 223 come through the shop that had of all things a chamfer on the firing pin hole. That's a head scratcher.

 

[AckleymanII]

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.

 

[timeout]

Might be time to bush the bolt.

Definitely bush the bolt and turn the pin down at the same time. I can see by your picture that the primers are flowing up around the firing pin and into the bolt itself. Bushing the bolt stops that. You will be amazed at the way your fired primers look after bushing the bolt. I predict you will no longer pierce any primers.

 

[AckleymanII]

Yes! Timeout is 100% correct. I am now shooting a hot load of Benchmark, cci 450, 55g at 3450 in my SPS 700's after the bolt has been bushed, tiny groups abound!