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  1. #1
    donsrno1
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    Default Primer Force/Pressure Required?

    I'm trying to find out approximate figures for what sort of force/pressure is required from a firing pin striking the primer in a bullet in order to succesfully ignite the primer? I would imagine it will vary a bit but its for a 0.22 short bullet I am particularly looking for figures if that helps.

    I have trawled the net but can't seem to find anything so if any of you could help by providing approximate values or links to any good sources that would be a great help.

    Thanks.

  2. #2
    Harley Dude sig232 will become famous soon enough sig232's Avatar
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    Default Re: Primer Force/Pressure Required?

    Quote Originally Posted by donsrno1
    I'm trying to find out approximate figures for what sort of force/pressure is required from a firing pin striking the primer in a bullet in order to succesfully ignite the primer? I would imagine it will vary a bit but its for a 0.22 short bullet I am particularly looking for figures if that helps.

    I have trawled the net but can't seem to find anything so if any of you could help by providing approximate values or links to any good sources that would be a great help.

    Thanks.
    The 22 rimfire does not have a primer to my knowledge. the primer is in the rim and can be touched off with very little effort if you hit it right. :)

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  3. #3
    donsrno1
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    Default Re: Primer Force/Pressure Required?

    Thanks for your reply, does anyone have any specific force or pressure figures by any chance? It's just that I really need to have specific figures for what I'm needing.

    If nobody has them could anyone point me in the right direction of where to find this information as I'm not having much luck in getting anything.

    Thanks.

  4. #4
    Senior Member NGF Addict! billt is on a distinguished road billt's Avatar
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    Default Re: Primer Force/Pressure Required?

    The only "test" I can think of would calculate comparative force. For example you could take an Aluminum rod that is longer and smaller diameter than the barrel, and face off the ends square on a lathe. Then insert it into the barrel with the gun in the vertical position and the firing pin cocked. If the rifle is "fired" in that position, (the end of the rod resting squarely on the bolt face), you could measure how far the rod traveled upward. I'm no mathematician but by knowing the exact weight of the rod you could then calculate how much energy it would take to move the rod upward that distance. Bill T.
    Liberals are a lot like Slinky's. Completely useless, but fun to watch when they're pushed down the stairs.

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    Ruler of Ramnation Ram Rod is on a distinguished road Ram Rod's Avatar
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    Default Re: Primer Force/Pressure Required?

    Sort of an odd query. I doubt very seriously you'll find anything definitive on the matter. Too many variables in my opinion. What sort of terms are you thinking? Lbs per sq cm? Averages? Different firing pin weights, firing pin spring loads/weights, speed of the firing pin, diameter of the pin, etc.....
    You may want to do your own tests in a lab. Use an actual firing pin in a hydraulic press on a primer in an otherwise empty case. Then press the pin downward on the primed case until the primer explodes. You'd likely need something in digital for better results. This still won't give you precise results, as part of the science to this would be the 'sharp' striking blow of the firing pin on the primer. You got a can of worms on your hand IMO----have fun in your quest.
    Ram Rod.............sans remords

  6. #6
    Harley Dude sig232 will become famous soon enough sig232's Avatar
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    Default Re: Primer Force/Pressure Required?

    I suspect that if you went to the CCI website and asked them the question you could find your answer. They produce primers and I am sure can tell you exactly how much pressure that it would take to touch off a primer.

    I have never seen anyone put up those stats, but any of the gun mfg or primer mfg have to have that info at hand to set the strikers, hammers, and firing pins to ignite the rounds.

    Try the tech forum over at GunBroker.com, I am sure someone will have the answer for you.

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