Firing pin strike!

  • Thread starter squirrelyhunter
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squirrelyhunter

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I've spent most of my time working with rimfire rifles and the strike of the firing pin is very important to the ignition of the round, is the same true for the center fire? The center fire rifle I'm working with looks like the pin is striking the primer oddly. The ring around were the pin has struck the primer is heavier on one side then the other just a little bit?

Thanks
 
Index your cases. My guess is you'll find the heavier ring to occur on top where there's less support.

al
 
Al,
I think that he is saying one of two things, either that the crater (a raised ridge around the indentation that the firing pin made) is not symmetrical, or that the firing pin strike is off center in relation to the primer. Perhaps he might clarify. It would also be helpful to know what kind (make, model) rifle we are discussing, and if it is "stock", or has been modified in any way.
 
The action is a 700 and the only modification was glass bedding over the aluminum bedding block. As for the raised indentation, it is not symmetrical. I would assume that it should be, and by it not being it could effect the ignition of the primer? The gun is a Remington xcr, not a custom rifle. Only modification is the bedding and a jewel trigger.

Thanks
 
There is probably a little looseness in the fit of the firing pin in the bolt, and this probably leaves a wider gap at the top of the firing pin tip. As to whether this is detrimental to accuracy, without a picture, it is have to make a judgment, but I doubt it. If the pin strike is reasonably well centered in the primer, and the depth of the indentation looks good, the crater happens after the primer has already gone off, and does not typically indicate anything more than a loose fit. If the primers do not rupture, then it is not really an issue as far as accuracy.

I have a .222 that is quite accurate. that is built on a Remington 722 action, and it leaves a substantial crater on primers, but they do not leak any gas. I could have Greg Tannel bush the firing pin hole and reduce the tip diameter for about $60, but it seems to shoot pretty well as is, having produced some groups in the ones, when properly tuned and driven.
 
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