extended barrel .40 S&W (or 9mm) vs standard barrel 10mm (or .357 Sig)

This is a discussion on extended barrel .40 S&W (or 9mm) vs standard barrel 10mm (or .357 Sig) within the General Firearm Discussion forums, part of the Related Topics category; Extended barrel .40 S&W vs standard size barrel 10mm. Extended barrel 9mm vs standard size barrel .357 Sig. So just wondering, is it true that ...

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Thread: extended barrel .40 S&W (or 9mm) vs standard barrel 10mm (or .357 Sig)

  1. #1
    VIP Member Array Thanis's Avatar
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    extended barrel .40 S&W (or 9mm) vs standard barrel 10mm (or .357 Sig)

    Extended barrel .40 S&W vs standard size barrel 10mm.
    Extended barrel 9mm vs standard size barrel .357 Sig.

    So just wondering, is it true that an extended barrel will push the performance of a .40 S&W to 10mm standard size barrel and a 9mm extended barrel performs much the same as a standard size .357 Sig?
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    Possibility look at this site:
    BBTI - 10mm

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    VIP Member Array glockman10mm's Avatar
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    Short answe is no. To get what you really want the barrel would be too long as to be inconvient. If you want a 10mm, buy a 10mm. There ain't no free lunch.
    Ignorance is a long way from stupid, but left unchecked, can get there real fast.

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    Distinguished Member Array LanceORYGUN's Avatar
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    Actually, the .357 Sig and 10mm would most likely benefit much more from having a long barrel. All of that extra powder they have would better burn in a long barrel.

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    VIP Member Array glockman10mm's Avatar
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    Quote Originally Posted by LanceORYGUN View Post
    Actually, the .357 Sig and 10mm would most likely benefit much more from having a long barrel. All of that extra powder they have would better burn in a long barrel.

    .
    Actually, the question was not if a 10mm or 357sig would benefit from barrel length, but if the 9mm and 40 could be made to approach or equal 10mm and 357sig velocities.

    And the correct answer technically , is a longer barrel would, depending on powder used give the 9 and 40 some velocity gain up to a point. But the barrel length would have to be longer than is practical for a pistol.

    Any small accomplishment in gain would be dimished as bullet weights were increased.
    The amount of powder used in these four cartridges is not the issue, it is the "burn rate" of the powder that determines ideal barrel length.
    Ignorance is a long way from stupid, but left unchecked, can get there real fast.

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    Distinguished Member Array LanceORYGUN's Avatar
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    Quote Originally Posted by glockman10mm View Post
    Actually, the question was not if a 10mm or 357sig would benefit from barrel length, but if the 9mm and 40 could be made to approach or equal 10mm and 357sig velocities.
    I realize that. I just don't think that either of those cartridges have enough powder in them to be able to take advantage of a longer barrel. Putting a long barrel on them is thus rather pointless, in my view. So the entire premise here of doing that is quite flawed, to my thinking.

    The .357 Sig and 10mm, though, often produce big muzzle blasts caused by powder that ends up being burned outside the barrel. They should be able to show a nice improvement in velocity if given a longer barrel, similar to what the 357 magnum cartridge gains when it is shot in longer barrelled revolvers.

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    VIP Member Array Thanis's Avatar
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    Quote Originally Posted by nn View Post
    Possibility look at this site:
    BBTI - 10mm

    Nice info...thxs...thxs 2 all 4 replies
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    S&W 642 (no-lock) with .38 Spl +P 135 GR Gold GDHP
    Glock G31 & G33 with .357 Sig 125 GR. SXT Winchester Ranger

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