question about light primer strikes

[taliv]

If there is evidence of a light strike on the primer, then it should only be 4 things at play: inconsistent primer cup hardness, firing pin dirty/defective, firing pin spring dirty/defective, or a headspace issue with the round not being positioned firmly against the receiver.

what if that only happens with one mag?

 

[Zendude]

what if that only happens with one mag?

Maybe start with the simplest solution first - shoot more rounds to make sure it’s not a statistical anomaly. I occasionally have issues with cci primers when shooting small revolvers in double action. I have not had any issues with the same guns with Remington, Winchester, or S&B primers. If the firing pin is just a little weak, cci primers will tell you.

 

[5-SHOTS]

Possibly (but not probably) at times the bolt/slide (whichever applies) is being held slightly out of battery? Maybe give the reciprocating part a firm tap with your palm before each shot to see if it alleviates the issue with the magazine in question.
Just brainstorming and may be completely off.

Good luck!

This.

 

[taliv]

This.

If that solves it, then the answer again would be to dispose of that mag right?

 

[Obturation]

If that solves it, then the answer again would be to dispose of that mag right?

I'd think so.
I assume the lightly struck cartridges fire fine from the glock brand magazine?
I couldn't see trying to respring or modify the aftermarket magazine to work when glock mags are common and fairly inexpensive .

 

[taliv]

I attempted to fire about half of them a second time. Some were lost to falling in mud and I didn’t want to put muddy ammo in chamber. Of the ones that got a second attempt prob half went off and half didn’t

 

[5-SHOTS]

If that solves it, then the answer again would be to dispose of that mag right?

Judging from the elements provided, in my opinion it is the fault of that magazine. The suggestion to use that magazine and tap the slide/bolt every round to make sure it is in full battery and see if the gun fires correctly, makes alot of sense to me. I would also check the cases fired with the other magazines to see if the striker's sign is deep enough. A not very powerful strike could also have a role in the issue.
I've seen multiple times Glocks going click instead of bang because not 100% into battery. I expect a gun with a similar design showing a similar malfunction when not in full battery.

 

[Walkalong]

Of the ones that got a second attempt prob half went off and half didn’t

I know you said you seated them deep enough, but that is classic under seated primers. Just simply "below flush" isn't always to the bottom of the primer pocket, which is where they need to be.

 

[taliv]

true, but when i'm running random range brass through a dillon 1050, it's not easy to seat each one to the bottom. i basically adjusted it as part of a test, to push the stem up a bit more, to the point i felt i might be pushing some too far. since it didn't stop the failures with that one mag, and since none of the other mags are having the issue, i'll prob back it out to my normal seating depth which i believe is appropriate. i wish there was a way to sense that on a progressive like you can hand seating match rifle primers

 

[243winxb]

all the failures are apparently occurring with just a single mag

I engrave each magazine with a number. How do you keep track of the problem one?

 

[taliv]

I only had one until yesterday lol (not counting the 33 round glock one which is easy to distinguish

the magpul ones have a place to mark with paint pen. I will do that eventually to the other ten. I use colored tape and sharpie on my ar and AICS mags