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July 23rd, 2009, 09:51 PM
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#1 |
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Senior Member
 
Join Date: Feb 2008
Location: North Florida
Posts: 1,011
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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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July 23rd, 2009, 10:14 PM
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#2 |
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Moderator
 
Join Date: Dec 2004
Location: Arkansas
Posts: 7,582
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Umm...No.
9MM is .355/.356 dia. .40 is .401 The 40 is larger.
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AR. CHL Instr. To compel a man to furnish funds for the propagation of ideas he disbelieves and abhors is sinful and tyrannical. Thomas Jefferson |
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July 23rd, 2009, 10:25 PM
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#3 |
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Senior Member
 
Join Date: Jul 2008
Location: upstate new york
Posts: 715
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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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July 23rd, 2009, 10:27 PM
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#4 |
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Senior Member
Join Date: Feb 2007
Location: Georgia
Posts: 988
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Maybe he was thinking of the 10mm and the .40
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July 23rd, 2009, 10:29 PM
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#5 |
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Distinguished Member
Join Date: Jul 2008
Location: The western edge of The Confederacy
Posts: 1,222
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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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"First gallant South Carolina nobly made the stand."  Edge of Darkness |
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July 23rd, 2009, 10:47 PM
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#6 | |
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VIP Member
Join Date: Sep 2007
Location: Sugar Land, TX
Posts: 3,142
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Quote:
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"We're in Texas....Things are different here."  NRA Life Member 
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July 23rd, 2009, 10:48 PM
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#7 |
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Member
 Join Date: Jun 2009
Location: Dayton, Ohio
Posts: 310
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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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July 23rd, 2009, 10:49 PM
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#8 |
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Moderator
Join Date: Dec 2004
Location: Arkansas
Posts: 7,582
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close enough...
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AR. CHL Instr. To compel a man to furnish funds for the propagation of ideas he disbelieves and abhors is sinful and tyrannical. Thomas Jefferson |
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July 23rd, 2009, 11:15 PM
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#9 |
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VIP Member
Join Date: Sep 2007
Location: Sugar Land, TX
Posts: 3,142
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FYI... 9mm = .3546"
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"We're in Texas....Things are different here." NRA Life Member
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July 24th, 2009, 03:33 AM
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#10 |
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VIP Member
Join Date: Feb 2008
Location: texas
Posts: 6,383
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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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