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The .327 mag has got to be superior to the .38 special in every aspect. Anybody care to argue that last point? If so...please educate me.
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To go head to head - I offer the following observations, as a for instance.
Speer's excellent 135 gr. Gold Dot for short barrels is kind of the new standard for .38 snubbies, so I'll stick to that one for comparison. It gives the required 12" of gelatin pernetration that the FBI sets out.
So does the new .327 Federal from a 3" barrel.
Federal loads their heaviest .32 cal bullet (115gr.) to 1300 fps.
Both of these rounds do the job to 12" (many agree that this is ideal). Let's use those most common of self defense rounds for a standard for our comparison.
By all accounts the .327 is louder in decibles than all .38 spl. It approaches the decible level of .357 mags. It matches the decibles of the lower recoiling .357's such as Speer Short Barrel and Remington Golden Sabre.
The .327 requires a 3" barrel such as the longer Ruger SP101 to perform properly. .38 spl. often uses 1 7/8" barrels.
Using equal barrel length of 3", I went to a recoil calculator for some figures.
http://www.handloads.com/calc/recoil.asp
I plugged in a 115gr. .327 at 1300 fps from a 3" barrel.
I have clocked the Speer round at 950fps from a 3" barrel - so I used that.
I used a 1.5 pound gun as typified by the Ruger SP101
The recoil results were:
Free recoil for .327 in foot pounds = 4.72
Free recoil for .38+p in foot pounds = 3.47
Recoil Impulse for .327 in pound sec. = .66
Recoil Impulse for .38+p in pound sec. = .57
So - we have two guns that will perform up to FBI standards.
We have one gun that is louder than the other. (Most agree that the subjective recoil of a louder gun is greater than one of lesser report.)
We have one gun that requires a 1" longer barrel than the other to perform properly.
And - we have one gun that has considerably more recoil than the other.
Laying aside final mushroom size for now - how is this first gun with a .32 size wound chanel superior to the second gun with a .357 size wound chanel?
Is there any on on the forum who would rather be stabbed to a depth of 12" with a slow moving broom handle rather than a fast moving ice pick?
Please educate me!