Firing Pin Bounce

F

Fred J

Active member
Let's change the subject here, and get some informative information. How do you control Firing Pin bounce, and what are the consequences if you have it?
 
firing pin bounce

Howdy Fred!

I believe Calfee said that the pin bouncing negatively impacted accuracy. It adds extra vibration.

I think he somewhat rounds the pin so that the pin strikes the rim and sticks a bit better. If I remember correctly, he compared it to using a fist to punch clay as an example.

It might still be in the archives, I was short on time and went from memory.

Take care!
Greg
 
I quess

With 230 plus views of this thread, you'de think someone would have a clue as to waht to do or not when you have FP Bounce.
 
My First thought Fred is how I would know if I had firing pin bounce? And if it bounced, how would I know if the bounce occurred before the bullet left the muzzle?
 
Stiffer or stronger spring perhaps?

I would imagine that would cause other problems with the initial strike.
 
Fred J said:
Is spring too Heavy or Spring to Soft?
Click to expand...

Or is the firing pin is to long and when the case is being pushed back against the bolt face its leaving another mark.

I would think if even if you get bounce with more than one hit, the strikes would all be in the same place, so to see 2 or more FP hits something would have to be moving.

Peter
 
Fred,

My guess is that the FP is traveling too far. Have you checked the max protrusion depth in relation to headspace?

s.
 
One foot print

When I say I see multiple hits, I don't mean I see more than one hit on the case. What I mean, is I see what appears to be a bouncing motion while watching the striker end of the firing pin. Is this what's causing my wild shots, or is it something else. It appears, that all the wild shots are high left regardless of the conditions. There is nothing loose, and the FP is not too long. It just seems that the FP strike is spongee. Head space os .042. I also see the same motion, with different HS, from .041 to .044. I have tried numerous springs, same results.
 
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Fred
Do check the protrusion of the FP, it has been relayed to me by George Stidworthy that the protrusion should be at .013 or .014 above the POCKET in the bolt. If the action is an Anschutz? the FP tunnel should be polished very smooth and use NO oil to lube, also the spring on the Annie mostly never wears out. I had a similar problem with a Kenyon smithed 37 and added a hevier spring to stop the bounce.

Clarence
 
Fred, you know more about this benchrest stuff than most of us will ever know, So I'm sure you check all the obvious stuff. But if you have tried various springs and you still see the high left shots, I'd start looking elsewhere. The only place I have seen these high left shots are out of a clean cool barrel. So I ask the dumb question does this only happen after you have had to wait a while for a condition and the barrel is cooling. I had something similar in the late nineties of needing to shoot a shot off the target every minute and a half to keep the gun shooting. I don't see this with my current barrels and bedding.
I guess you can see this bounce dry firing with a spent case.
Do you have a chronograph that you can see the velocity of these high left shots as compared to good shots? If it is firing pin strike I would guess those shots would have a higher velocity. Doesn't make sense. If it is vibration the velocity would be the same.
I have noticed indoors that if the gasses left in the barrel are blown out you get higher shots and velocity. With a breeze this doesn't happen as the breeze cleans out the barrel after each shot.
Is the barrel borderline free floating that it touches lightly occasionally? Rich
 
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