Thread: Primer failure rate.

[QUOTE=Rn-85;1720564]I've been primarily reloading with Fiocchi lr 6 i seem to regularly have dud primers. Sometimes, firing it twice will make it work, but often not. I think it would be about 4% failure rate, maybe more.

Two questions,
Is there something I'm doing that's causing this? Primer seating dept? Ect...

Are other brands more reliable?

Cheers

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I had similar issues with a batch of fiochhi large rifle primers about 3 years ago, the packet had a large red band across it. I bought some more fiochhi maube 18 months ago and packet is now predominantly black and I've never had a miss fire, same rifle, same brass.

I would suggest you investigate other causes for misfires.

The fact that they sometimes fire on a 2nd ot 3rd try strongly suggests to me that your sizing equipmemt is suspect.

Shoulders pushed bach just a tad to much will cause this every day.

Disassemble your bolt and clean, inspect for damage, not common, but possible.

[QUOTE=mark_k;1720978]

Originally Posted by Rn-85

I've been primarily reloading with Fiocchi lr 6 i seem to regularly have dud primers. Sometimes, firing it twice will make it work, but often not. I think it would be about 4% failure rate, maybe more.

Two questions,
Is there something I'm doing that's causing this? Primer seating dept? Ect...

Are other brands more reliable?

Cheers

Sent from my SM-G780G using

I had similar issues with a batch of fiochhi large rifle primers about 3 years ago, the packet had a large red band across it. I bought some more fiochhi maube 18 months ago and packet is now predominantly black and I've never had a miss fire, same rifle, same brass.

Attachment 282412

Yeah this pack is about 5 years old, so maybe? Its black with a red band

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Originally Posted by Jaco Goosen

I would suggest you investigate other causes for misfires.

The fact that they sometimes fire on a 2nd ot 3rd try strongly suggests to me that your sizing equipmemt is suspect.

Shoulders pushed bach just a tad to much will cause this every day.

Disassemble your bolt and clean, inspect for damage, not common, but possible.

I dont think the shoulder is too far back as I was shoulder bumping. But you'd think FL resize should still get proper engagement. Ill take a look at the bolt.

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Ill just nexk size the next 20 or so and see how it plays out. That will work out the potential sizing issues

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Originally Posted by Rn-85

I dont think the shoulder is too far back as I was shoulder bumping. But you'd think FL resize should still get proper engagement. Ill take a look at the bolt.

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Over FL resizing creates a head space issue and causes misfires. Case moves forward on firing pin engagement I think.

Cheers Tahr. You spelled it out. If the shoulders are pushed to far back the cartridge is loosefitting in the chamber, when the firing pin connects with the primer, it will indent, BUT for a milisecond the cartridge will accellarate/move with the firing pin. And in doing so the firing pin pushes(denting) the primer, rather than striking it.

Two totally differnt energy delivery dinamics. A quick sharp strike at X amount of energy is much more powerful compared to a slower push at the same energy level.

Had very few primer issues from federal or cci, if they are it tends to be a bad batch and lots of failures like bad batch of federal small pistol primers the CAS guys found the other year. If I have had issues with primers not going off it tens to be the firearm like other guys have said. Hammer springs being lightened or dirty parts.

Never had a dud primer and only recently has my reloading slowed right down. Been given primers that have been rattling around loose in a draw for years and various other lots that havnt had any special storage and they have all gone bang....

The horrific practice of neck sizing eliminates the shoulder pushed back problem...

Originally Posted by Rn-85

I dont think the shoulder is too far back as I was shoulder bumping. But you'd think FL resize should still get proper engagement. Ill take a look at the bolt.

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If you don't have the tools to check bump/headspace, a simple trick is tu but layers of sticky tape on the case head on a sized case. Once once you feel resistance it's easy to measure the thickness of the tape and work out the amount of headspace.

[QUOTE=Rn-85;1721069]

Originally Posted by mark_k

Yeah this pack is about 5 years old, so maybe? Its black with a red band

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This is the packaging of the ones I had issues with.
Two different packs of them if I remember correctly.

I've not had an issue with any primer since, Cci, rws or newer Fiocchi

That's the one I've got. Bought a shit load and have a shit load to go...

What do you think your failure rate was?

Quick question, how to i rule out the headspace or resize issue with a live round?

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Originally Posted by blip

The horrific practice of neck sizing eliminates the shoulder pushed back problem...

Whats wrong with neck sizing?

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Originally Posted by Rn-85

That's the one I've got. Bought a shit load and have a shit load to go...

What do you think your failure rate was?

Quick question, how to i rule out the headspace or resize issue with a live round?

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Failure rate was high enough, maybe 1 in 10 or there abouts.