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chip3757
03-12-2009, 11:03 PM
Anyone happen to know what the fps difference is as the barrel length changes for your average 357 round?

3"

4"

6"

jmf_tracy
03-13-2009, 9:22 AM
rule-of-thumb is 25 FPS per inch, but that is from rifle barrels. it is not that much and it does not matter too much.

cineski
03-13-2009, 9:26 AM
I thought it was 100 fps?

big jon
03-13-2009, 10:08 AM
not what you were asking for but close. K38-6in vs M36 2in
http://i52.photobucket.com/albums/g23/jhunter63/IM004515.jpg

ontmark
03-14-2009, 6:32 AM
This is from an armorer on Sigforum

This is a repost of information gathered over the past few years. Sorry that it's a little jumbled, but I don't have the time to sort it all at the moment. Different original posts are separated by lines.

Note that all figures cited are instrument velocities (start screen 9-10 feet from muzzle, stop screen 4 feet farther) at an elevation of 10,000 feet above sea level.

____________________________________________

The figures following the gun model are average instrument velocity (start screen at 10') and standard deviation.

357 SIG

Gold Dot, 125 grain JHP, “standard” (higher velocity), bulk pack reclassified:
P226 - 1420 fps, S.D. 8, 20 rounds
P229 - 1369 fps, S.D. 13, 20 rounds
P239 - 1357 fps, S.D. 12, 20 rounds
* P226 - 1389 fps, S.D. 12, 25 rounds
* P229 - 1341 fps, S.D. 16, 25 rounds
* Earlier lot.

Winchester Ranger, 125 gr SXT JHP:
P226 - 1358 fps, S.D. 20, 20 rounds
P229 - 1325 fps, S.D. 14, 25 rounds
P239 - 1299 fps, S.D. 14, 20 rounds


40 S&W

Gold Dot, 155 grain JHP, (53961):
P226 - 1195 fps, S.D. 11, 17 rounds
P229 - 1148 fps, S.D. 13, 16 rounds
P239 - 1140 fps, S.D. 11, 17 rounds

Gold Dot, 165 grain JHP, bulk pack reclassified:
P226 - 1035 fps, S.D. 10, 20 rounds
P229 - 1007 fps, S.D. 9, 20 rounds
P239 - 994 fps, S.D. 10, 20 rounds

9mm Parabellum

Gold Dot, 124 grain JHP
P226 (4.4" barrel) - 1119 fps, S.D. 25, 19 rounds
P226 (4.9" barrel) - 1132 fps, S.D. 18, 10 rounds

Gold Dot, 124 grain +P JHP
P226 (4.4" barrel) - 1213 fps, S.D. 20, 10 rounds
P226 (4.9" barrel) - 1226 fps, S.D. 16, 8 rounds
P229 (3.9" barrel) - 1206 fps, S.D. 16, 20 rounds

_____________________________________________

Guns used were P226 with both standard 4.4" and 4.9" threaded “Tactical” barrel, P229 with 3.9" barrel, and P239 with 3.6" barrel. (All lengths given are nominal.)

The start screen of the chronograph was placed about 9 feet from the muzzles of the guns. Velocities are given in feet per second and are the averages of the number of rounds fired in parentheses.

CCI Blazer (aluminum) 115 grain FMJ (3509), lot D21P1
* These results are significantly slower than I’ve obtained previously.
P226 4.9" barrel: 1138 fps (25)
P226 4.4" barrel: 1102 fps (25)
P229 3.9" barrel: 1066 fps (25)
P239 3.6" barrel: 1061 fps (25)

Winchester “white box” 115 grain FMJ (Q4173), lot 27UG82
P226 4.9" barrel: 1172 fps (25)
P226 4.4" barrel: 1141 fps (25)
P229 3.9" barrel: 1114 fps (25)
P239 3.6" barrel: 1092 fps (25)

Winchester NATO 124 grain FMJ (Q4318), lot SF92
P226 4.9" barrel: 1170 fps (15)
P226 4.4" barrel: 1130 fps (25) (previous session, same lot of ammunition)
P229 3.9" barrel: 1118 fps (30) (previous session, same lot of ammunition)
P239 3.6" barrel: 1103 fps (15)

Federal 124 grain +P+ Hydra-Shok (P9HS3G)
P229 3.9" barrel: 1109 fps (25)

Federal American Eagle 124 grain FMJ (AE9AP)
P229 3.9" barrel: 1028 fps (25)

Winchester 115 grain +P+ Ranger SXT (RA9115HP+)
P229 3.9" barrel: 1321 fps (14)

Winchester 115 grain Silvertip (X9MMSHP)
P229 3.9" barrel: 1122 fps (25)

Data from previous sessions:

CCI Blazer (aluminum) 115 grain FMJ (03509)
P229 3.9" barrel: 1154 fps (20)

CCI Blazer (aluminum) 124 grain FMJ (03578)
P226 4.4" barrel: 1105 fps (25)
P229 3.9" barrel: 1079 fps (20)

Federal 115 grain “Classic” Hi-Shok (C9BP)
P229 3.9" barrel: 1117 fps (20)

Federal NATO Ball M882, 124 grain FMJ
P226 4.4" barrel: 1096 fps (25) (Yes, it’s the same as the 229.)
P229 3.9" barrel: 1096 fps (30)

Federal “Personal Defense” 135 grain Hydra-Shok) (PD9HS5 H)
P229 3.9" barrel: 1018 fps (19)

Remington 124 grain +P Golden Saber
P229 3.9" barrel: 1116 fps (20)

Speer 124 grain Gold Dot (53618)
P226 4.9" barrel: 1132 fps (10)
P226 4.4" barrel: 1112 fps (19)

Speer 124 grain +P Gold Dot (53617)
P226 4.9" barrel: 1226 fps (8)
P226 4.4" barrel: 1213 fps (10)
P229 3.9" barrel: 1206 fps (20)

Winchester 127 grain +P+ Ranger SXT
P229 3.9" barrel: 1230 fps (25)

_________________________________________

Gold Dot “reclassified” chronographed using an Oehler 35P with start screen at 10' from the muzzle (velocities rounded to 5 fps):

357 SIG, 125 grain (part number 95423B)
Lot 1
P226 - 1420 fps (20 rounds)
P229 - 1370 fps (20 rds)
Lot 2
P226 - 1390 fps (25 rds)
P229 - 1340 fps (25 rds)
Lot 3
P229 - 1360 fps (20 rds)
Note that Speer markets two varieties of 357 SIG Gold Dots, the “standard” and the “limited penetration.” The above figures pertain to the standard which is loaded to a somewhat higher velocity than the LP. Speer’s data claims 1350 fps for the LP and 1375 fps for the standard, both from a 4" barrel (muzzle velocity as compared to my instrument velocity).

40 S&W, 165 grain “reclassified” (part number 953947B)
P239 - 995 (20 rds)
P229 - 1005 (20 rds)
P226 - 1035 (20 rds)
Speer claims a muzzle velocity of 1150 fps for this cartridge from a 4" barrel, but their current part number for the round indicates that the stuff I chronographed may not be same load. I believe the “reclassified” ammunition was the “low recoil” load that Speer reportedly developed for a Federal law enforcement agency and marketed for a time.

To summarize, the reclassified 357 SIG load that I chronographed met the factory’s velocity claims. The 165 grain 40 S&W load was a good 150 fps slower, but I’m not certain that what I tested was equivalent to the current factory load.

____________________________________

Edited to clarify range conditions and elevation.

JDoe
03-14-2009, 7:31 AM
Here ya go... Ballistics by the Inch, 3 guys, 2 chronographs and 7,000 rounds of ammunition. http://www.ballisticsbytheinch.com/

Why "ballistics by the inch"? Well, just about forever people have wondered what kind of trade-off one made in choosing a gun with a short barrel - how much power were you giving up for convenience/concealability? There has been a lot of anecdotal information available - comparing this 2" .38 to that 6" .38, or a longslide .45 to an officer's pistol with a shorter barrel - but there hasn't been much in the way of consistent research made available to the average gun owner. In the 1980s American Rifleman did some tests using a .44 mag revolver, cutting the barrel down from 18" to 1", and back in the 1930s someone did something similar with a 30-30. But just try and find that data quickly. And further, how does that data compare to your 9mm or .32? Do they all lose power at the same rate? Are some ammos better for your purpose than others?

We were curious just exactly what the drop-off in velocity was for a given caliber over a range of barrel lengths, and using a variety of available ammunition. So, we decided to do some actual testing. And, we wanted to make this information freely available as a service to gun owners everywhere. This website is the result.

Enjoy! :thumbsup:

ontmark
03-14-2009, 7:35 AM
Here ya go... Ballistics by the Inch, 3 guys, 2 chronographs and 7,000 rounds of ammunition. http://www.ballisticsbytheinch.com/



Enjoy! :thumbsup:

Good Info Thanks