.40SW versus 9mm bullet diameter

This is a discussion on .40SW versus 9mm bullet diameter within the Reloading forums, part of the Defensive Ammunition & Ballistics category; Couldn't figure a better place to ask this than to ask the reloading crowd. Guy in the shop today said something that I totally disagree ...

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Thread: .40SW versus 9mm bullet diameter

  1. #1
    Distinguished Member Array Tally XD's Avatar
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    .40SW versus 9mm bullet diameter

    Couldn't figure a better place to ask this than to ask the reloading crowd.

    Guy in the shop today said something that I totally disagree with even though I actually have no reference to prove it.

    He, for whatever reason, decided to spout out that ".40sw is the same size as a 9mm".

    Huh?

    I pulled both rounds from the ammo cabinet and proceeded to compare. Hmmmm. . . . . . the 40sw sure looks a good bit larger than 9mm to me.
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    Umm...No.

    9MM is .355/.356 dia.

    .40 is .401

    The 40 is larger.
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    Senior Member Array boscobeans's Avatar
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    OAL of the 9 and the 40 are very close. Maybe that's what he was talking about.

    bosco

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    Maybe he was thinking of the 10mm and the .40
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    The .40 is actually 10mm. A 10mm auto and .40 S&W auto fire the exact same bullet housed in two different casings.
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    Quote Originally Posted by automatic slim View Post
    The .40 is actually 10mm. A 10mm auto and .40 S&W auto fire the exact same bullet housed in two different casings.
    Neither is actually 10mm... 10mm=.3937" ... not that it matters...
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    and as I recall the 10mm uses the longer housing.

    It's not to hard. google a conversion program and convert 9mm to inches. It will not be .40
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    close enough...
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    FYI... 9mm = .3546"
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    yes but the bullet diameter used in reloading is as posted 9mm .356 ,40 .401.I think he may have been thinking about 357 sig and 9mm,they both use a .356 bullet and the 357 sig is a 40 cal case necked down to take a 9mm bullet
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    #1 Keep up with current trends: SIZE DOESN'T MATTER! LOL

    #2 Shot placement trumps caliber every time.
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    Quote Originally Posted by ExSoldier View Post
    #1 Keep up with current trends: SIZE DOESN'T MATTER! LOL

    #2 Shot placement trumps caliber every time.
    I agree that shot palcement trumps caliber, but it sure makes me feel better knowing the junk of lead or copper headed down range is of a larger caliber, just in case!

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    9mm uses .355 bullets
    40 uses .400 bullets

    Lead bullets are usually oversized one thou to seal the bore. .356 is for .38 Super.
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    Quote Originally Posted by boscobeans View Post
    OAL of the 9 and the 40 are very close. Maybe that's what he was talking about.

    bosco
    Haha!! Guy came in the shop this morning and had to eat crow!! It was OAL that he was reading about not diameter. Should have took his bet (my pistol against something he had)
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