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- Newsgroups: sci.military
- Path: sparky!uunet!paladin.american.edu!gatech!hubcap!ncrcae!ncrhub2!ciss!law7!military
- From: fcrary@ucsu.Colorado.EDU (Frank Crary)
- Subject: Re: Sonic Sniper Locater
- Message-ID: <C17vxC.F8y@law7.DaytonOH.NCR.COM>
- Sender: military@law7.DaytonOH.NCR.COM (Sci.Military Login)
- Organization: University of Colorado, Boulder
- References: <C0CC60.H23@law7.DaytonOH.NCR.COM> <C0E5pq.6z9@law7.DaytonOH.NCR.COM> <C0syvK.66v@law7.DaytonOH.NCR.COM>
- Date: Thu, 21 Jan 1993 18:41:36 GMT
- Approved: military@law7.daytonoh.ncr.com
- Lines: 41
-
-
- From fcrary@ucsu.Colorado.EDU (Frank Crary)
-
- In article <C0syvK.66v@law7.DaytonOH.NCR.COM> dans@bigbird.llnl.gov (Dan Simkins) writes:
- >I find your contention that rifle silencers work by decelerating the bullet to subsonic speeds
-
- >My arguments against:
- >1) The most significant factor in the report of a firearm comes from supersonic gases escaping at
- > the muzzle, not the shock from the bullet. The 45 ACP is always subsonic, yet produces alot of
- > noise.
-
- That's a pistol round. Your quite correct to say most of the report from
- a _pistol_ is gas escaping the muzzel. However, the shockwave from a
- supersonic rifle bullet is a large part of a rifle's report.
-
- >2) In the case of a 223 Rem, it has a muzzle velocity of about 3200 fps generated in a 24" barrel.
-
- I suspect many calibers couldn't be silenced effectively. I've never
- heard of a silencer for an M-16, or anything else firing .223 Rem.
- I _think_ silencers which slow the bullet to subsonic speeds are generally
- for submachineguns and carbines whose bullets are normally only slightly
- supersonic. Alternately, it might be possible to silence .223 Rem, if
- a reduced powder load was used (of course, this probably wouldn't
- cycle the action...)
-
- >3) A subsonic rifle bullet would seem to defeat the operation. The trajectory would be radically
- > different. In fact, such a rifle bullet would have a trajectory that is more like a .22 long rifle
- > than a high-power rifle. The energy of a bullet is a function of the square of the velocity, hence
- > a subsonic is very low.
-
- I don't think anyone said a silencer didn't effect the ballistics...
- If there wasn't a major price to pay for using a silencer, wouldn't
- they be a common feature on military rifles? Also, I think a subsonic,
- silenced rifle round would be more like a pistol round of the same
- caliber, not a .22LR (I.e. .223Rem would be like .22LR, .308Win roughly
- like 9mm/.357, .50BMG like .44) I think it's because of these
- disadvantages, that military snipers rarely use silencers.
-
- Frank Crary
- CU Boulder
-
-