Well done ‘slash 
Mis-fires or Weak/Broken Spring.
- Thread starter camodog
- Start date
Strip and clean the bolt, it only takes a bit of a primer cap , grit etc inside the bolt to really mess things up . Good clean and re-lube gets this sorted most times
#6 / #34
'Thingy no worky' is not an explanation
I'll concede that I may be wrong , the cases being undersized hasn't proven that to be the cause , just a possible cause ! It requires 0.025" of primer penetrative to bottom out the anvil on the primer . Factory firing pin protrusion set at 0.050 to 0.060" would require massive undersize to cause a light strike.
Be4 and after measurements please . Everyday is a school day .
Last edited:
Sorry had to nip out! 
Further to my above post , if the problematic ammunition is greater than 0.020 " shorter than chamber then I'll concede to being wrong on this occasion , poor chamber fit is most likely to be the cause of light primer strikes . Well done you .I've got broad shoulders!
As it stands there are still unanswered questions , including firing pin protrusion and this ammos primer reliability ? It would be good to see the offending batch number to see if others have encountered the same issues .
What's the point of a forum without debate and discussion ?
Further to my above post , if the problematic ammunition is greater than 0.020 " shorter than chamber then I'll concede to being wrong on this occasion , poor chamber fit is most likely to be the cause of light primer strikes . Well done you .I've got broad shoulders! As it stands there are still unanswered questions , including firing pin protrusion and this ammos primer reliability ? It would be good to see the offending batch number to see if others have encountered the same issues .
What's the point of a forum without debate and discussion ?
Last edited:
Smellydog
Well-Known Member
One thing I learnt about primers and firing pins is percussion.
It's not the length of the pin penetrating the cap but percussion.
Working with steel, plate and sections if you want to move steel with a hammer it matters not how hard you hit it if it can spring or bounce back. If a cartridge can move forward from the firing pin strike some of the percussion is lost.
Take my Winchester 94ae. I was getting misfires a few months ago. The cause was insufficient case sizing which meant the case was not head spaced on the rim of the rimmed case. The firing pin in effect was seating the whole cartridge into the chamber just a fraction and percussion was being lost sufficient enough to cause a misfire.
In the case of this bottle neck rimless round if it's not bottomed out in the chamber sufficiently enough at the shoulder some percussion will be lost.
It's not the length of the pin penetrating the cap but percussion.
Working with steel, plate and sections if you want to move steel with a hammer it matters not how hard you hit it if it can spring or bounce back. If a cartridge can move forward from the firing pin strike some of the percussion is lost.
Take my Winchester 94ae. I was getting misfires a few months ago. The cause was insufficient case sizing which meant the case was not head spaced on the rim of the rimmed case. The firing pin in effect was seating the whole cartridge into the chamber just a fraction and percussion was being lost sufficient enough to cause a misfire.
In the case of this bottle neck rimless round if it's not bottomed out in the chamber sufficiently enough at the shoulder some percussion will be lost.
EH?
Foxyboy43
Well-Known Member
Hmmm. Depends on your background/work experience really. Plenty good enough for me to be honest.
Agreed , a case that gives too much relative headspace will effectively be riding the punch until the shoulder reaches a hard stop . At that point some of the strikers energy for percussion has been lost . In which case if the firing pin protrusion is insufficient then it will also fail to do its job as it falls short of the anvil , a weak spring may give a similar result .
I've had .223 cases that have had 0.010 " relative headspace , they never failed to detonate and my usually sized cases with 0.002" shoulder bump fail on the odd occasion .Primers ?
You still can't discount other possibilities just because it fits your narrative , a single measurement is not totally conclusive .
It's a high possibility that @caberslash was correct in his diagnosis, we'll have to wait and see if the issue presents itself at a later date .
Smellydog
Well-Known Member
Yes, absolutely, why only the other day I had a misfire, completely baffled I am as the brass is all correctly sized
I had similar with Sako ammo in my T3 223,three consecutive misfires in the same box , but used another 70 in the batch and are fine.
After having spoken to both Hornady and Edgar Brothers it would appear there's been similar issues with the rounds at the centre of this debate.
Both Hornady & EB were prompt and diligent in their responses and I am pleased to say that a satisfactory outcome has been arrived at.
Once again I wish to thank everyone for taking the time to contribute their thoughts.
'Camodog'.
Both Hornady & EB were prompt and diligent in their responses and I am pleased to say that a satisfactory outcome has been arrived at.
Once again I wish to thank everyone for taking the time to contribute their thoughts.
'Camodog'.
Suspect these would still fire out of a semi auto with a floating firing pin or possibly a controlled round feed rifle.
Brass would be pretty pointless to reload though as it would be streched significantly unless the chamber was short.
Not seen a case head separation on the first firing (and don't want to either...
)Similar threads
