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 ...
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.
“I am consistently on record and will continue to be on record as opposing concealed carry.”
- Barack Obama Chicago Tribune, April 27, 2004
Umm...No.
9MM is .355/.356 dia.
.40 is .401
The 40 is larger.
It is better to live one day as a lion, than a thousand years as a lamb...
AR. CHL Instr. 07/02 FFL
Maker of cool things to shoot
Array
OAL of the 9 and the 40 are very close. Maybe that's what he was talking about.
bosco
Array
Maybe he was thinking of the 10mm and the .40
CRIME..... LAW DEFINES, POLICE ENFORCE, CITIZENS PREVENT!
FOUR BOXES KEEP US FREE: [1] SOAP [2] BALLOT [3] JURY [4] AMMO!
Array
The .40 is actually 10mm. A 10mm auto and .40 S&W auto fire the exact same bullet housed in two different casings.
"First gallant South Carolina nobly made the stand."
Edge of Darkness
Neither is actually 10mm... 10mm=.3937" ... not that it matters...Originally Posted by automatic slim
"Texas can make it without the United States, but the United States can't make it without Texas!".... Sam Houston
Retired LEO
Firearms Instructor
NRA Life Member
Array
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
"The smallest minority on earth is the individual. Those who deny individual rights cannot claim to be defenders of minorities." - Ayn Rand
NRA Member / Ohio Conceal Carry Instructor
CHL Holder
close enough...
It is better to live one day as a lion, than a thousand years as a lamb...
AR. CHL Instr. 07/02 FFL
Maker of cool things to shoot
FYI... 9mm = .3546"
"Texas can make it without the United States, but the United States can't make it without Texas!".... Sam Houston
Retired LEO
Firearms Instructor
NRA Life Member
Array
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
"Outside of the killings, Washington has one of the lowest crime rates in the country,"
--Mayor Marion Barry, Washington , DC .
Array
..........
Glock 19 in a Crossbreed supertuck EDC
Ruger LCP W/ CT "the go anywhere gun" EDC
"ALWAYS carry!NEVERtell!"
Thumper
Array
#1 Keep up with current trends: SIZE DOESN'T MATTER! LOL
#2 Shot placement trumps caliber every time.
Former Army Infantry Captain; 25 yrs as an NRA Certified Instructor; Avid practitioner of the martial art: KLIK-PAO.
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!
Array
9mm uses .355 bullets
40 uses .400 bullets
Lead bullets are usually oversized one thou to seal the bore. .356 is for .38 Super.
07/02 FFL/SOT
Commercial ammunition reloader
I currently only serve local customers and do not ship ammunition. Thanks for understanding.
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)
“I am consistently on record and will continue to be on record as opposing concealed carry.”
- Barack Obama Chicago Tribune, April 27, 2004
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