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Old November 27, 2012, 10:27 PM   #85
Deja vu
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Join Date: March 14, 2010
Location: Border of Idaho & Montana
Posts: 2,183
Quote:
No 357Mag touches that number either, in a carry gun. Stating "FPS" without barrel lengths is pointless.

Note the results from Ballistics by the Inch:

357Mag 4" barrel
Corbon 110gr 1,351fps
Corbon 125gr 1,477fps
Corbon 125gr DPX 1,438fps
Federal 125gr 1,436fps

357sig 4" barrel
Corbon 115gr 1,472fps
Corbon 125gr 1,410fps
Corbon 125gr DPX 1,273fps
Federal 125gr 1,367fps

You need 10" (10 inch!) barrels to get to your "1,750fps". Nobody, positively NOBODY, carries a 10" revolver.

You also need to realize that a revolvers barrel is measured IN FRONT of the cartridge while a semi-auto (and every thing else besides revolvers) is measured from the breach-face. In other words, a 357sig (cartridge length 1.240") with a "4 inch barrel" actually has the revolver equivalent of a 2 3/4" barrel and a 357Mag (1.59") with a "4 inch barrel" has a 357sig equivalent a 5.59" barrel. So even comparing barrels that are both "4 inches", is really not fair.

A fair comparison, as done by Ballistics by the Inch, using Encore/Contender barrels to equal the playing field, shows the following:

357mag, 4" barrel:

Corbon 125gr JHP 1,496
Corbon 125gr DPX 1,471
Federal 125gr 1,511

357sig 4" barrel:

Corbon 125gr JHP 1,468
Corbon 125gr DPX 1,317
Federal 125gr 1,426

So, "on average", the Mag has an advantage but it ranges from virtually zero to perhaps 150fps.

as far as the barrel length in my experience a 6 inch barrel on a semiautomatic will be faster than a 6 inch barrel on a revolver.

I never posted the data on my 6 inch 686 but I have a review on my 357 magnum automatic (coonan)

http://thefiringline.com/forums/showthread.php?t=495750

as you can see in that review I was getting about 1800 FPS (900 foot pounds) with my Coonan Classic. My 686 with the same rounds was doing about 1700 FPS (the buffalo bore web page states a bit over 1700 with there 6 inch revolver as well)

While I dont know if this is true of a 10mm or a 45acp or a 9mm or 357 sig I can say that I have tested it and the 357 magnum runs hotter from a semiautomatic if the barrel length is the same in a revolver and an auto.
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Shot placement is everything! I would rather take a round of 50BMG to the foot than a 22short to the base of the skull.

all 25 of my guns are 45/70 govt, 357 mag, 22 or 12 ga... I believe in keeping it simple
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