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Author Topic: Firing Pin Depth  (Read 621 times)

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Offline mattparliament

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Firing Pin Depth
« on: March 22, 2007, 10:54:49 AM »
Hey guys.  I was doing some thinking last night about the 35 whelen's and the misfires.  After some thought I grabbed the action and noticed that I could push the firing pin further forward with my finger than the hammer does.  I didn't measure it but it was obvious to the naked eye.  I wondered if shaving some material off of the hammer surface that hits the receiver would increase firing pin depth and help out with the misfires.  Has anyone tried this with any results?  Should I leave it the heck alone?  Is it possible to have a firing pin strike too deep?  Any thoughts?
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Offline PartsMan

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Re: Firing Pin Depth
« Reply #1 on: March 22, 2007, 11:04:13 AM »
Somebody did that on another rifle.
It worked but be carful not to puncture primers.
Also it will have to be checked with accesory barrels.
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Offline Fred M

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Re: Firing Pin Depth
« Reply #2 on: March 22, 2007, 11:27:05 AM »
Matt.
Many bolt actions have  0.055" f-pin protrusion. My two Handi's had 0.035" and I increased that to 0.045". Punching through a primer takes a lot more impact than a Handi can provide. That is with a nicely rounded  f-pin.

Most of the no spark came from a weak hammer spring together with hard primers.
You can look at my web site and learn how I tuned the f-pin and pin seat.

Very few bolt actions with 0.055" protrusion will punch through a primer with a well rounded f-pin.
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Fred M.
From Alberta Canada.

Offline Walks with a gimp

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Re: Firing Pin Depth
« Reply #3 on: March 22, 2007, 02:45:56 PM »
  I miked the length of the hammer and took .010" off the face of the hammer with a belt sander and no more misfires in my 500 S&W. Before the modification it would only fire about 50% of the time.
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Offline mattparliament

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Re: Firing Pin Depth
« Reply #4 on: March 23, 2007, 03:59:32 AM »
Thanks for the info guys, I'll have to measure it and see if this is my next project.  I'll have to try one of the rounds that I saved that were "misfires" and see if it will touch off.
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Offline Walks with a gimp

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Re: Firing Pin Depth
« Reply #5 on: March 23, 2007, 01:40:23 PM »
  All the mis-fires that I had with my .500 went off with the second hit.
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Offline mattparliament

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Re: Firing Pin Depth
« Reply #6 on: March 31, 2007, 01:55:35 PM »
just measured mine and it is .042", think that's enough?  I've used my 270, 45-70, any 22 hornet all on the same frame without a misfire.  Maybe I should leave well enough alone and use Fred's cream of wheat recipe to fire-form my whelen brass before I load them up, may be a simpler answer...  any thoughts?
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Offline quickdtoo

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Re: Firing Pin Depth
« Reply #7 on: March 31, 2007, 02:03:11 PM »
Here's a previous thread with some pertinent info by Fred.

Tim

http://www.graybeardoutdoors.com/smf/index.php/topic,80643.msg496285.html#msg496285
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