Minimum force required to ignite the hardest factory small pistol (9mm) primers?

Discussion in 'Ammunition & Reloading' started by comeback_kid, May 3, 2013.

  1. comeback_kid

    comeback_kid New Member

    Hello all,

    It has been a while since posting on this forum, but I have had an intriguing thought and figured I would ask around and see what I can discover.

    I'm not a hand loader, but I'm assuming "small pistol primers" are good for 9mm Luger, and that's what I'm specifically referring to in this question.

    To address the problem, there are a few things I am interested in knowing.

    First, what are the hardest small pistol primers found on the shelves in factory ammunition (by hardest I mean requiring the most striking force to ignite)? I've always been told CCI.

    Second, what is the minimum force required to ignite said primers reliably?

    Lastly, how can I calculate the striking force of a firing pin in a Beretta 92FS?

    The reason I found this interesting is because I have a Beretta 92FS that I doctored up, so to speak. I put a lighter "D" main spring in (can't recall right away what the actual rating was) and a skeletonized hammer (unsure of the weight at the moment). I have shot a few hundred hand loads with CCI primers through it, and I'm more than confident that light primer strikes will not be an issue.

    However, I am mainly interested in the numbers, just out of curiosity. If any engineers or mathmaticians out there wants to explain these questions to me in mathspeak, I would be very grateful.

  2. robocop10mm

    robocop10mm Lifetime Supporting Member Lifetime Supporter

    I can tell you that on a Smith and Wesson revolver in .38 Spl it requires a 3 1/2 pound main spring. The .357 Mag requires 3 3/4 pounds for reliable ignition. I do not know how that translates into actual striking force, but gives you something.

    And yes, CCI primers are considered the hardest primers available.

  3. JonM

    JonM Moderator

    Your going to need to know the mass of the firing pin. The area of the tip of the pin that strikes the primer. How much area of the pin that rubs against the firing pin channel. How much firing pin return spring tension you have and the friction factors of the hammer strut, hammer and hammer pivot pin. And finally how strong the firing pin spring is.

    I prefer going out and shooting and if my gun sets primers off i call it a day.

    The reason the 92fs has a very strong hammer spring is it has to hold up to field military conditions where the gun may need to be fired with a dirty firing pin channel. That extra hammer force could be needed.

    I leave my 92's fp springs bone stock