January 24, 2012, 06:41 PM | #1 |
Member
Join Date: January 10, 2012
Location: Apache junction, AZ
Posts: 50
|
.40 S&W Carbine?
Anyone chrono'd a .40 sw out of a 16.5 in barrel? I'm curious on velocity increase. I'm thinking about buying a .40 carbine and am wondering what velocity increase (if any) I might experience.
|
January 24, 2012, 07:01 PM | #2 |
Senior Member
Join Date: September 4, 2011
Location: Vermont
Posts: 1,552
|
I've heard estimates of 10-15% increase in muzzle velocity, based on 9mm carbines.
Shouldn't be too far different with a .40, I would think. |
January 24, 2012, 10:36 PM | #3 |
Senior Member
Join Date: November 20, 2010
Location: WesTex
Posts: 958
|
__________________
"And I'm tellin' you son, well it ain't no fun, staring straight down a .44" -Lynyrd Skynyrd |
January 24, 2012, 10:45 PM | #4 |
Member
Join Date: January 10, 2012
Location: Apache junction, AZ
Posts: 50
|
Wow "Crazy88Fingers" thanks for the site it will help alot, lots of neat information.
|
January 25, 2012, 08:10 AM | #5 |
Member
Join Date: October 5, 2010
Location: Wichita Falls, Tx
Posts: 94
|
A .40 in a carbine brings the power and velocity up to a 10mm. Do a little research on the 10mm, and why the FBI no longer uses it. Basically its good on larger animals but bad for anti personnel
|
January 25, 2012, 08:19 AM | #6 | |
Moderator Emeritus
Join Date: June 25, 2008
Location: Austin, CO
Posts: 19,578
|
Quote:
They quit using it because their agents couldn't control the power. SW reduced the loads and then realized they could use shorter cases with the reduced loads... Hence the 40SW was born. The 10mm is a fantastic round if you know how to control the gun. Most modern 10mm is loaded to the reduced power levels of 40SW so unless you load your own or buy expensive premium ammo there's not much difference. |
|
January 25, 2012, 08:25 AM | #7 | |
Registration in progress
Join Date: November 1, 2008
Location: I can be found on a number of other forums.
Posts: 1,333
|
Quote:
|
|
January 25, 2012, 09:06 AM | #8 |
Senior Member
Join Date: March 5, 2009
Posts: 206
|
Yeah, Peet's got it right.
Oh, and bqglock - you're welcome. Jim
__________________
James Downey http://www.ballisticsbytheinch.com/ - BBTI handgun cartridge research http://www.guns.com/author/jim-downey/ - Guns.com where I'm a features/review writer http://www.communionofdreams.com/ Communion of Dreams - my current novel. |
January 25, 2012, 04:15 PM | #9 | |
Member
Join Date: October 5, 2010
Location: Wichita Falls, Tx
Posts: 94
|
Quote:
Read the paragraph below this line from from here; It refers to the .40 cal in the Kel Tec sub 2000. So why not the .40? Well, when you put the .40 S&W in a Rifle form, it has the power of a 10mm. Now the 10mm is a powerful round. The FBI liked this, when it was invented in 1984. In fact it was too powerful, and had to be scaled down (hints the FBI lite loads). Some may remember the problems the FBI was having in the late 80's /early 90's, so they switched to the .40 S&W. The 10mm was a good round when loaded to 950 fps. They basically had to scale it down because it was over penetrating (plus too big of guns, and too powerful for smaller agents to handle), and the bullet was not delivering the kinetic energy to the target. The bullet would just pass through. So when they developed the .40 cal, it was a slower fps and it delivered the energy to it's target. The .40 is basically a 10mm lite. So to the point, when you use a .40 S&W in a Rifle, it will be too powerful and go right through, not stopping the target as quickly. |
|
January 25, 2012, 04:44 PM | #10 |
Moderator Emeritus
Join Date: June 25, 2008
Location: Austin, CO
Posts: 19,578
|
Well, I'm not about to rehash all the arguments about over-penetration and "stopping power" all over again. Suffice it to say that I do not subscribe to your theories.
__________________
Nobody plans to screw up their lives... ...they just don't plan not to. -Andy Stanley |
January 25, 2012, 10:27 PM | #11 |
Senior Member
Join Date: January 29, 2011
Location: Texas
Posts: 1,328
|
OP which 40 carbine you thinking of getting?
|
January 25, 2012, 10:31 PM | #12 |
Member
Join Date: January 10, 2012
Location: Apache junction, AZ
Posts: 50
|
^ I haven't decided yet I wanted to see if getting one would be worth it. I have a glock 32 with a lone wolf .40 barrel and wanted a long gun. just thought i would get one with ammo i already have other than .22 and no long guns are made in .357 sig
|
January 25, 2012, 10:40 PM | #13 |
Moderator Emeritus
Join Date: June 25, 2008
Location: Austin, CO
Posts: 19,578
|
|
January 25, 2012, 10:48 PM | #14 |
Member
Join Date: January 10, 2012
Location: Apache junction, AZ
Posts: 50
|
Anyway i want to keep my carry gun the way it is
|
January 27, 2012, 10:51 AM | #15 |
Member
Join Date: January 29, 2009
Posts: 88
|
bq - I have a Beretta CX4 in .40S&W. Through the chronograph, the carbine w/ 16.6" barrel was approx. 250fps faster than the PX4 w/ a 4" barrel. This increase was almost the same in 2 different bullet weights.
__________________
Steve |
January 27, 2012, 12:20 PM | #16 |
Senior Member
Join Date: October 25, 2004
Location: Vinita, OK
Posts: 2,552
|
I have an AR-15 in .357 SIG. Ron Williams made the DI upper for me. LW lower that uses Glock 31 mags. 9" barrel.
re: the 10mm. I'm sure they were having over penetration issues with the original full power ammo. The Norma loads were 200 grains. But it's important to remember that handgun ammunition has experienced a titanic shift in the last 10-15 years. These are the Golden Years. When you look at Gold Dots, and Critical Defence, and PDX1 Bonded, and Golden Sabers, and CorBon DPX, etc, etc, etc... I'm quite sure they could develop a full velocity 10mm load that would give just exactly the right amount of penetration. But they would still have to face the larger grip. It could probably be done if .40 S&W wasn't working just fine. Look at how SA was able to somehow make a .45 ACP version of the XD that feels like a .40 in your hand. If the FBI wanted to buy such a thing, I'm sure they could do the same thing with 10mm. Gregg |
January 27, 2012, 04:55 PM | #17 |
Senior Member
Join Date: November 14, 2004
Location: Greenwood, IN
Posts: 773
|
Funny you should ask----I just bought an ATI JR (Just Right) Carbine in .40 cal. I have only shot it for function and don't have a chrony, but it does seem to pack (seat of the pants) a little more punch. For the record, it is a very nice carbine and uses Glock mags, I have a Glock 22, so all the mags I have will fit. Saves on ammo and mags. It has a picatinny rail system as well as a flat top configeration so a lot of AR stuff fits as well.
|
January 27, 2012, 07:08 PM | #18 |
Member
Join Date: January 10, 2012
Location: Apache junction, AZ
Posts: 50
|
^ How much did it cost? i just saw some vids on youtube and i like it alot! being i have 3 glock mags already
|
January 28, 2012, 12:22 AM | #19 |
Senior Member
Join Date: January 7, 2000
Location: Idaho
Posts: 6,073
|
The way I read the chart in "Ballistic by the Inch", it looks like the lighter bullets get more boost from the barrel length. 180gr. don't speed up too much. 135gr. speed up quite a bit.
__________________
I am Pro-Rights (on gun issues). |
January 28, 2012, 09:05 PM | #20 | |
Senior Member
Join Date: December 16, 2004
Location: Grand Forks, ND
Posts: 5,333
|
Quote:
__________________
I don't carry a gun to go looking for trouble, I carry a gun in case trouble finds me. |
|
January 29, 2012, 07:44 AM | #21 |
Senior Member
Join Date: April 22, 2007
Posts: 1,996
|
Here is some chrono data I got a few years ago with my KelTec Sub2k and CZ-40B. The KT has a 16" barrel and the CZ has a 4.3" barrel.
Doubletap 155gr Gold Dot = 1247fps from the CZ and 1564fps from the Keltec Doubletap 180gr Gold Dot = 1124fps from the CZ and 1400fps from the Keltac Magtech 155gr JHP = 1136fps from the CZ and 1401fps from the Keltec Masttercast 180gr Cast FP = 939fps in the CZ and 1137fps in the Keltec |
January 29, 2012, 08:57 AM | #22 |
Senior Member
Join Date: January 30, 2011
Location: New England
Posts: 1,449
|
The FBI got rid of their 5.56 mm carbines (M4) and went to a .40S&W carbine (M4). Believe it or not the 40S&W does better then a .223/5.56 for barrier penetration at typical engagement ranges, (note that the average police sniper shot is 70 yards.)
|
|
|