Anschutz firing pin shape

C

Carlzone

Guest
Hi

I read an Calfee article about the shape of the tip of the pin, saying the best ignition is achieved when the pin hits 'inside' the rim (= not striking on the edge of the case rim.)

First: Is this correct?

Anyway, I have an extra firing pin for my 2013 for some "experiments" :)

If I want to make my pin strike inside the rim's edge, is it just to carefully grind off/down the part where the tip now hits the edge? Is the remaining tip enough to create a good ignition?

Any help or other input is appreciated.
Thank you

/ Carlzone
 
I used to work on Annies every day almost exclusively. I always tried to shape the tip so that it provided a crisply defined "whack" just inside the out rim of the case. I'd shape it so that it had (guessing now) about .015-020 width. The idea being to concentrate the force of the impact on a surface just broad enough to ensure the case wasn't penetrated enough to cause a rupture.

I realize this is kinda vague in description. I wish I had a sample around here.

Hope this helped.

C
 
Thank you for your reply.
Did you notice an improved accuracy by doing this shape, compared to the Annie factory "whack"?
 
None. Just ensure you have a good spring. If a high round count gun suddenly starts stringing vertical one of my first "fixes" is to ditch the old spring. Its a lesson from long ago that's saved my bacon more than once.
 
Carlzone said:
Hi

I read an Calfee article about the shape of the tip of the pin, saying the best ignition is achieved when the pin hits 'inside' the rim (= not striking on the edge of the case rim.)

First: Is this correct?

Anyway, I have an extra firing pin for my 2013 for some "experiments" :)

If I want to make my pin strike inside the rim's edge, is it just to carefully grind off/down the part where the tip now hits the edge? Is the remaining tip enough to create a good ignition?

Any help or other input is appreciated.
Thank you

/ Carlzone
Click to expand...

Yes sir...after reading Bill's article, I began to apply this to .22 target pistol pins... Model 41s, Marvel conversions and Karts... There is no doubt that it improves ignition for pistols, which lack the firing pin force of rifles..In my early days,(1960s) I worked extensively in cold forming of fasteners, which involves "metal flow". I am ashamed that I didn't recognize this long ago. I have always contoured and polished the pins, but never thought of allowing for the increased crush resistance at the rim radius.. That's why Bill's info is legend..

Jerry
 
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