Which is quieter?


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speaksoftly
August 9, 2010, 10:36 PM
I'm planning on buying a silencer and looking hard at the Silencerco Osprey. I have three pistols that I'm considering for the can (Sig P226, P229 or M&P 40). All the pistols are in .40 but I've thought about getting a 9mm barrel and magazine setup. I'm mainly going for the quietest (in terms of dB) silencer and round possible. Would a 9mm or .40 caliber be the quietest between the two? Thanks for any info.

-Marcos

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taliv
August 9, 2010, 10:57 PM
does somebody make subsonic 40cal? if not, 9mm subsonic would be a good bit quieter

Rail Driver
August 10, 2010, 12:25 AM
http://www.precisionweapons.com/CartGenie/prod-72.htm

Subsonic .40S&W in stock.

speaksoftly
August 11, 2010, 02:46 AM
Still doesn't answer the question as to which of the two calibers would be quieter but thanks.

Rail Driver
August 11, 2010, 02:53 AM
To put it simply, the 9mm will likely be much quieter than the .40 for the simple fact that the report of a 9mm is less than that of a .40 combined with the fact that the muzzle of the can on a .40 is larger than the muzzle of a 9mm can thereby allowing more of the original report to follow the bullet out of the muzzle.

A .40 can shot wet (if so designed) could conceivably be quieter than a dry can on a 9mm, but that gets into concepts that are a bit more advanced and I'm not a physics teacher.

The 9mm is the way to go if you want quiet... if you REALLY want quiet, get a .380 and put a 9mm can on that (unless you can find one made specifically for .380?) or get a .22 can and a p22 or Mk III or buckmark

Ironman
August 11, 2010, 03:17 PM
Of the pistol centerfire calibers 9,40,45...9 is quieter than the rest. Most of the time its hard to suppress a .380 because the blowback operation leads to more gas escaping the action than a recoil operated system. The best host for suppression(tested) is a SigP226 and when paired with a Osprey or TiRant..its as quiet as it gets when using pistol cans and 147grn ammo.

RyanM
August 12, 2010, 12:09 PM
Pretty sure standard 180 gr. .40 S&W is subsonic.

Anyway, yeah, as said, the smaller the caliber, the quieter the gun will be, all else equal.

Rail Driver
August 12, 2010, 01:37 PM
To clarify, a quote from one of my books:

The speed of sound is 343 meters per second, (1,125 ft/s).

Anything slower than 1125fps is subsonic.

Ranb
August 13, 2010, 12:51 AM
The speed of sound varies a lot with temperature. At 0C (32F) it is 331 mps (1087 fps), at 32C (90F) it is 350 mps (1149 fps). I load my subsonic ammo to 1050 fps.

I think the 9mm would be less noisey all other factors being equal as the silencer bore is smaller.

Ranb

LiquidTension
August 13, 2010, 08:42 AM
^ What he said.

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