Bill Calfee
Gun Fool
Why..................?
CYA friends:
Since we're about to get the MD-PAS triple, for the masses, that we must have to advance rimfire accuracy past where we're at today, and since we're exploring MD-PAS verses any form of SAP ignition, I'd love to know a "why" about something.
Why?
Back when I converted XP's to 22 LR, and when I would develop my ignition, here's the way I went about it:
I'd fire some rounds in my bucket, and save the empties to re-use to develop my ignition, which included locating the firing pin footprint in the proper location.
What I'd do, to keep from having to fire so many rounds in my bucket, would be to turn one of the empties up-side-down, then close the breech bolt while pulling the trigger, so the firing pin would rest against the case head.
Then I struck the cocking piece lightly with a little brass hammer, which imparted a footprint in my empty case head.
And then I'd adjust the footprint location accordingly, etc.
But right off the bat I made an interesting discovery.
At first I left the firing pin spring out, with the breech bolt fully assembled otherwise.
But I discovered, that when I adjusted my footprint location doing it this way, no spring, when I reassembled the breech bolt and fired a live round in my bucket, the footprint location changed.
So I quickly learned that I had to have a firing pin spring in the bolt, to guarantee the footprint I got, by using my little brass hammer, remained the same when I live fired the action.
I found I couldn't easily do this operation with a full spring in the bolt, so I made up a short spring that just tied the ignition components together and it worked just fine thereafter.
And from then on I got along just fine doing this, saving a lot of shooting in my bucket, which is noisy and wastes ammo.
Now here's the "why" I'd like to know:
How come I can develop my ignition, and footprint location, in MD-PAS actions, without needing a firing pin spring, shortened or otherwise?
And the live fire footprint location is the exact same as the one I obtained with my little brass hammer?
But with SAP ignition, I found I had to have some semblance of a firing pin spring in the bolt, before the live fire footprint would be the same as the one produced with my little brass hammer?
Why?
Your friend, Bill Calfee
CYA friends:
Since we're about to get the MD-PAS triple, for the masses, that we must have to advance rimfire accuracy past where we're at today, and since we're exploring MD-PAS verses any form of SAP ignition, I'd love to know a "why" about something.
Why?
Back when I converted XP's to 22 LR, and when I would develop my ignition, here's the way I went about it:
I'd fire some rounds in my bucket, and save the empties to re-use to develop my ignition, which included locating the firing pin footprint in the proper location.
What I'd do, to keep from having to fire so many rounds in my bucket, would be to turn one of the empties up-side-down, then close the breech bolt while pulling the trigger, so the firing pin would rest against the case head.
Then I struck the cocking piece lightly with a little brass hammer, which imparted a footprint in my empty case head.
And then I'd adjust the footprint location accordingly, etc.
But right off the bat I made an interesting discovery.
At first I left the firing pin spring out, with the breech bolt fully assembled otherwise.
But I discovered, that when I adjusted my footprint location doing it this way, no spring, when I reassembled the breech bolt and fired a live round in my bucket, the footprint location changed.
So I quickly learned that I had to have a firing pin spring in the bolt, to guarantee the footprint I got, by using my little brass hammer, remained the same when I live fired the action.
I found I couldn't easily do this operation with a full spring in the bolt, so I made up a short spring that just tied the ignition components together and it worked just fine thereafter.
And from then on I got along just fine doing this, saving a lot of shooting in my bucket, which is noisy and wastes ammo.
Now here's the "why" I'd like to know:
How come I can develop my ignition, and footprint location, in MD-PAS actions, without needing a firing pin spring, shortened or otherwise?
And the live fire footprint location is the exact same as the one I obtained with my little brass hammer?
But with SAP ignition, I found I had to have some semblance of a firing pin spring in the bolt, before the live fire footprint would be the same as the one produced with my little brass hammer?
Why?
Your friend, Bill Calfee
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