Strength Of Lee Enfield Action

[Peter Laidler]

As a part time physics teacher and one who's conversant with Boyles laws of gas and one who's been in the Armouring game a LONG time, I would seriously question the notion that a ruptured primer would produce sufficient gas to overcome the striker spring sufficient to compress it and.... on and on..... while at the same time, always taking the line of least resistance - as a gas will always do - past the non existant gas checks and venting in every direction at every opportunity .......... and ...... Oh, save us from this please..............
I'll say no more for fear of losing my usual diplomatic touch with words.

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[ireload2]

As a part time physics teacher and one who's conversant with Boyles laws of gas and one who's been in the Armouring game a LONG time, I would seriously question the notion that a ruptured primer would produce sufficient gas to overcome the striker spring sufficient to compress it and.... on and on..... while at the same time, always taking the line of least resistance - as a gas will always do - past the non existant gas checks and venting in every direction at every opportunity .......... and ...... Oh, save us from this please..............
I'll say no more for fear of losing my usual diplomatic touch with words.

It is widely known to anyone that reads and reloads that gas venting through firing pin holes blows firing pin assemblies back.
As a part time physicist you should be able to calculate the gas volume that can escape through the firing pin bore during the time that same gas is propelling the bullet down the bore. Now considering that escaping gas has a much higher velocity than the bullet you should easily understand how the firing pin can be blown back.
You have the area of the firing pin spring flange being acted upon by the gas. I could calculate this pressure if you wish but I am sure you can do it too.