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Double Rifles, Single Shots & Combinations >> Building Double Rifles & Gunsmithing
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Marrakai
.416 member


Reged: 09/01/03
Posts: 3563
Loc: Darwin, Top End of Australia
Re: Bushing firing pin holes, vent holes necessary?
      25/01/09 01:34 AM

I think many people miss the point about bushing firing pins.

It is done to prevent gas escape from blown primers!

If a firing pin and associated hole in the breech-face are too large, the pressure from firing will push the firing-pin back and the primer will expand into the hole, either locking the gun closed, or in extreme cases rupturing and blowing gas into the action as per the Ellis Brown example. If the firing pins are correctly bushed, using modern reloading components, there will be no escaping gas to redirect!

The old Scott patents for gas-ports in the breech-face were 'invented' at a time of black powder, corrosive primers, weak metal alloys, and questionable reloading practices in the colonies. There is no need for them today, which is why no contemporary maker gives them a second thought.

--------------------
Marrakai
When the bull drops, the bullshit stops!
--------------------------------
www.marrakai-adventure.com.au

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Subject Posted by Posted on
* Bushing firing pin holes, vent holes necessary? doubleriflejack 24/01/09 10:30 AM
. * * Re: Bushing firing pin holes, vent holes necessary? MacNaughton360   24/01/09 12:15 PM
. * * Re: Bushing firing pin holes, vent holes necessary? Marrakai   25/01/09 01:34 AM
. * * Re: Bushing firing pin holes, vent holes necessary? André   23/02/09 09:37 PM
. * * Re: Bushing firing pin holes, vent holes necessary? DarylS   24/02/09 03:41 AM

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