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Here's a question: How come I never see round-nose .40 S&W?

Discussion in 'Caliber Corner' started by Airborne Infantryman, Jan 24, 2010.

  1. Airborne Infantryman

    Airborne Infantryman 'Murica!

    Nov 20, 2009
    Its weird, and I've been pondering it for a while:

    How come you never see flat nose 9mm rounds?

    How come you never see round-nosed .40 S&W?

    I've seen flat-nosed .45 ACP; forgot what brand it was.

    BTW, what grain was 9mm, .40 and .357 Magnum created around? From what I understand, developers created .45 ACP around a 230 grain bullet......wasn't .357 created around a 125 grain bullet?
  2. macatex


    Jul 23, 2009
    I can say that when reloading for my 10mm using a RN bullet does not allow for correct seating and crimping. The crimp happens on the tapered portion of the bullet which just doesn't work. I've found that only FP bullets work since the strait sides are longer before they taper to the tip. Maybe there is a similar issue with the .40?

    I have found both RN and FP bullets in .380, 9mm, .357 SIG, and .45 ACP. Why the ammo manufacturers choose which they use is a mystery to me.

  3. Steel Head

    Steel Head Tactical Cat

    Jan 1, 2010
    A cat box in WA
    Even though the 40 S&W case is longer than the 9mm both are loaded to same overall dimesion
    Flat nose to get the 40 same as the round nose 9mm
  4. Berto

    Berto woo woo

    Sep 15, 2003
    They do load 147gr 9mm FMJ flat nosed for OAL reasons.
  5. novaDAK


    Apr 17, 2006
    Flat nose 9mm:

    You don't see round nose .40SW because the cartridge was designed to fit into 9mm sized handguns and magazines, and therefore the cartridge overall length had to be no longer than a 9mm cartridge. Couldn't do that without a flat nose bullet.

    I don't remember what the original 9mm bullet weigh was, I think it was somewhere between 112 and 124gr though. The .40SW I believe was designed around a 180gr bullet since it was adapted from 10mm. The .357mag was known for its 158gr LSWC bullets back when it came out.
  6. deadmonkey90

    deadmonkey90 Pro Bass Angler

    Feb 15, 2009
    NW Indiana
    Its my understanding that they are flat nosed because they were designed to be hollow point rounds first.
  7. ronin.45


    Apr 24, 2008
    It is a weight issue. Using a flat nose they can load the heavy 180gr. bullet while keeping the length short enough to feed properly. With a roundnose profile the same weight bullet has to be longer.
  8. fredj338


    Dec 22, 2004
    No, actually the first 40 bullets were FMJ. Besides there were many RN profile JHP back when the round was developed. As noted, to get the heavier bullets into a 9mm OAL, you have to square the bullet up & make it shorter. You will find sone RN bullets, usually lead, under 160gr.
    The 9mm was originally designed around a 124gr FMJ bullet, 357mag, the 158grLSWC, and the original 45acp was a 200gr bullet, but changed before full production & acceptance by the Army.