M&P in 9mm Major

Original 


    I bought an M&P C.O.R.E. 5 inch, then a Trijicon RMR to go on it for my first reflex-sighted pistol.  I shot it and carried it for several years.  I had heard of 9mm Major, but never experimented with it.  then I saw John Wick 3: Parabellum. In it, Charon recommends the caliber.  It had never occurred to me that someone might commercialy load 9 Major.  I bought a 24 pound recoil spring, then a stainless steel barrel in 9mm.  It had to be plain stainless, because a throat reamer won't cut nitrided steel, and the rifling starts way too close to the chamber for the long-loaded  9mm Major rounds.

    Barrel
    35-Pistol-Throater

I have fired multiple brands of 9mm Major through it with zero issues.  Any time I try a new brand I always do a "Plunk test" with the barrel, just to make sure the new round isn't resting on the lands of the rifling.(that would cause chamber pressure to skyrocket.  If it does I'll need to take the throat reamer and lengthen the leade just a little more.)


    M&P CORE

    Closeup

    I also bought another barrel and rechambered it for .356 TSW. I love this cartridge almost as much as 9mm Major, but it's a lot harder to find commercial ammunition.  As far as I can tell only Underwood is still making it. (I've also rechambered several other pistols for this wonderful cartridge.)

     Fun project.



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