Thread: Primer failure rate.

@Rn-85 if you want to try a comparison I'll give you 50 or so of the other lot of them to try.

Have a look at this thread, I didn't want to hijack yours but they are similar circumstances I suggest . . .

https://www.nzhuntingandshooting.co....asures-117785/

Originally Posted by blip

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

So does annealed brass and correct FLS. It is not rocket science but some get it horribly wrong.

Originally Posted by Rn-85

Whats wrong with neck sizing?

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Apparently its not the right thing to do. Ive always matched my brass to my rifles chamber but for reasons Im not getting, doing this it makes unaccurate ammo

It has nothing to do with precision, there just isn't any good reason to do it over FL sizing with a small bump, which prevents extraction and feeding issues.




Primer failure rate should be effectively zero. If you have failures you have a rifle, loading process, or primer QA issue.

I’m having trouble with these primers also.high failure rate has cost animals.
Could well be my sizing,as they are also a little stiff to get the bolt right down?
Thoughts?
Had my firing pin spring amended but still getting it.
Probably a waste of money getting that done and the problem is in the sizing somewhere

I WAS having issues seating were primers.... But then realised I was using incorrect shell holder..... In saying that,giving primer pockets a good working over helps no end in getting things started and seated properly.

Stiff to get bolt right down.... Two things,firm is ok as it SUGGESTS your partial length resize is about right...left as large as it should be. But if bolt isn't completely down.....it may be the issue.

@mickey Duck
Thanks ok.little bit harder to close on than I think they should be.
Think I should pull em to bits and start again

So you could... Pull projectiles n powder... Give wee bump in die with guts removed,try in chamber again,bump again if still firm,until it's not...then reassemble...if you think primers not seated deep enough..while case is empty,give it a bit more welly in appropriate tool,then reassemble. I have a expander rod with no primer pushing rod so it's ideal for this,you can back the stem out enough if careful and resize as normal ,excluding the primer thing,others will remove live primer and recycle it....

I had a bad run of 55gr hornady .223 factory ammo a few years back, pretty much one in every mag in my T3 at the time would misfire, very frustrating when trying to take out mobs of goats

Die adjustment. FYI.

For reference.
I measured up the troublesome round, with a Hornady comparator tool and compared it to a fired round.

Dud round - 40.99mm
Fired round - 41.22mm
A difference of 0.23mm or 0.009"

Is that too much difference?
What do you rocket scientists think?

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Thanks for this. You"ve basically proofed my point/suspision.

Headspace is only 0.1mm or 0.004"

Meaning, 0.2mm is more than double the amount of shoulder push back allowed. Any more than 0.1mm is and you"ve created yourself a headspace issue. Your cartridges will fit loosely in the chamber, you'll have "miss fires/primer issues" and your case life will be shorter.

I"ve always been saying a case comparstor is one of the most important tools a reloader should own. Buy one before you purchase your press.

There’s plenty of factory ammo (sized within SAAMI specs ) out there that has more headspace than that in some rifles and it goes bang most of the time. Just most don’t measure shop bought ammo.