short barrel velocities


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ldhulk
December 23, 2011, 10:09 AM
I wish the reloading manuals and powder websites would make data available on velocities obtained in short-barrelled handguns. Hodgdons doesn't specify anywhere what barrel length they are using, as far as I can see, and most of the books list data for 6" or longer barrels. When choosing a load for a 38 or 357 snub, it would be helpful to be able to compare data that was actually obtainable instead of what the loads do in 6 or 8 inch barrels. I would expect the slower powders like 2400 to lose more in a short barrel than Unique or Bullseye, but I'm only guessing.

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gamestalker
December 23, 2011, 11:00 AM
I do a bunch of loading for snubs using slow burning powders, especially H110/296 for magnum wheel guns, and also HS6 and Longshot for the other wheel guns and auto loader's. I then chronograph them and compare that with what is in my books. It varies quite a bit, but I still get really decent velocities I think.
For .357 magnum with 125 gr. JHP 1500's fps.- 158 gr. JHP 1350's fps
38 spcl. 110 gr. JHP with Longshot 1250+ - HS6 a bit more. 125 gr. JHP around 1100's fps.
9mm 115 gr. JHP with HS6 1200 + - Longshot upper 1200's 115 gr. JHP
.40 165 gr. JHP Longshot 1150's - HS6 up tp 1100 fps.

Those are short barrel velocities. My longer barreled velocities with the same loads are slightly better, but not by a huge margin.

Steve C
December 23, 2011, 11:34 AM
Hodgdons doesn't specify anywhere what barrel length they are using, as far as I can see, and most of the books list data for 6" or longer barrels.

If you select the print option when viewing a load on Hodgdon's website it will bring up a printable page with all the information including the test barrel length. Best if you show a single powder load. Generally the data is from 7" or longer test barrels.

Seedtick
December 23, 2011, 02:59 PM
It doesn't necessarily act like you, well me anyway, would think it should regarding barrel length and velocity.

Whatever powder gives the highest velocity in a long barrel will also give the highest velocity in a short barrel.

The choice you have to make is how much muzzle blast & flash you can live with.

My choice is 2400, as it works well and gives very good performance at a grain under max in my S&W K-Frames.
H110/W296 will give slightly higher velocity, but only when running balls-to-the-wall max loads.

rc

Here's the link to the entire thread. (http://www.thehighroad.org/showthread.php?t=599467)

Seedtick

:)

forty5
December 23, 2011, 03:08 PM
Speer No 14 list loads for short barrel revolvers in 38 Speial, 38 Special +P and 357 Magnum using thier 135 gr Gold Dot bullet. It gives the velocity out of short barrels.:)

454PB
December 23, 2011, 04:14 PM
Another good reason to own a chronograph.

Over the last 37 years of owning a chronograph, I've seen more "theories" blown to pieces than I can count.

As an example, the same ammo fired in my 4" .357 magnum actually measures slower than when fired in my 2 1/2" .357 magnum. Yes, it's logical that a shorter barrel will yield less velocity, but not always true. Chamber size and throat and barrel diameter can have a significant effect on velocity.

ldhulk
December 23, 2011, 06:17 PM
Thanx to all for the responses. I'm trying to find a good load in the 38+p+ range, or low end 357, to be used in an Ruger SP101 (357 chamber). The back of the trigger guard was whacking my middle finger until I got a set of aftermarket grips which fill in the area behind the triggerguard. Now it's a 2-finger grip, but more comfortable than before.

JDGray
December 23, 2011, 06:31 PM
Another good reason to own a chronograph.

Over the last 37 years of owning a chronograph, I've seen more "theories" blown to pieces than I can count.

As an example, the same ammo fired in my 4" .357 magnum actually measures slower than when fired in my 2 1/2" .357 magnum. Yes, it's logical that a shorter barrel will yield less velocity, but not always true. Chamber size and throat and barrel diameter can have a significant effect on velocity.

Its impossible to compare velocities between different length barrels, of different firearms. I bet the theories would be more accurate, but not to practical, by cutting the barrel and retesting velocities. I bet it would be very predictable, cutting down a match grade barrel, maybe not so consistant in a factory production barrel.

223man
December 23, 2011, 06:38 PM
Check out http://www.ballisticsbytheinch.com/. I've yet to see anything more exhaustive on the subject.

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