Thanks Dusty, the action is a Nesika K 1.470" dia.Looks like you need a new firing pin spring or some work on your bolt. What action is this on?
Looks to me like a combination of firing pin clearance and weak spring, possibly some drag inside the bolt. The firing pin is bouncing back after a delayThanks Dusty, the action is a Nesika K 1.470" dia.
What kind of work on the bolt do you mean? btw: of course bolt face is perfectly squared
How many times has it been sold? Most times thats a good indicator...incidentally this specific rifle has never shot screaming groups; on the other hand we've deeply checked it and found nothing wrong but sometime this odd primer cup shaping
The rifle is brand new (our own build): it's an F/TR rig with Nesika K 1.470" action, 30" Krieger Heavy Palma 1:9.5" barrel, McM XIT stock and Jewell BR triggerHow many times has it been sold? Most times thats a good indicator
Wouldn't that more likely be tight firing pin/excessive spring tension and possibly a low pressure load?Looks to me like a combination of firing pin clearance and weak spring, possibly some drag inside the bolt. The firing pin is bouncing back after a delay
https://thefiringline.com/forums/showpost.php?p=5417594&postcount=17F. GUFFEY -Concaved, you are not going to believe this, vacuum, the bullet started down the barrel without enough pressure to force the bullet out, when the bullet got to the end of its travel a vacuum was created, with a choice, the bullet could have returned or the vacuum could have collapsed the primer.
Wouldn't that more likely be tight firing pin/excessive spring tension and possibly a low pressure load?
Not enough pressure for the primer cup to push the pin back, so it forms around it?
Checking that would be as simple as firing a case with primer only and seeing if it was crushed the same way or possibly worse.
Pocket pressure is estimated to be around 2700 psi (if i remember correctly?) when fired with no powder in the case. From search here https://discover.dtic.milfiring a case with primer only
Do your primers look like this every shot? Or every now and then? Will a no-go gauge chamber in your rifle? Have you checked for excessive chamber depth?every now and then
I've this shape every now and then, regardless of pressure level (i.e. factory ammo and reloading alike)Do your primers look like this every shot? Or every now and then? Will a no-go gauge chamber in your rifle? Have you checked for excessive chamber depth?
thanks Al.... what in your opinion should be a correct (minimum) firing pin fall distance for Nesika?The Nesika's are notorious for weak ignition.
The first thing to do is check the amount of firing pin fall. -Al
Pocket pressure is estimated to be around 2700 psi (if i remember correctly?) when fired with no powder in the case. From search here https://discover.dtic.mil
Before firing a primer only, no powder, measure head to datum. Is shoulder set back after primer firing?
30-06 ammo when fired with no flash hole (spit hole) has deformed the shoulder.