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Subsonic & Specialty Ammo   
 • 5.56/.223 Ultra Stealth Match Subsonic
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 • .300 Winchester Magnum Subsonic
 • .338 Lapua Magnum Subsonic
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Frangible Ammo
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 • .300 Winchester Magnum Frangible

Government & Military
 • 40mm CQB
 • 7.62/.308 Limited Penetration
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 • 5.56/.223 Subsonic

 • .50 cal Anti Ricochet
 • 6.5 EBR

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"The Straight Dope" Information and Tools
 • READ ME Proper Use of Subsonic Ammunition
 • Why use Phosphate Removal for Subsonic Ammunition?
 • Instructions on how to use EBR Phosphate Removal

 • Ballistics Calculator
 • Greenhill Formula For Rifling Twists
 • Twist Rate, continued

 • First-Round Pop
 • Subsonics Do Not Like Long Barrels!
 • The Use of Mil-Dots & Subsonic Ammunition
 • 7.62 Thumper vs. 7.62 PBS?
 • Speed of Sound Chart
 •
Use of Subsonic Ammunition
 • Verifying Stability
 • FAQ - Frequently Asked Questions

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5.56mm NATO/.223 Ultra Stealth Match Subsonic

This is the most quiet and accurate 5.56 x 45mm "sub-sonic" round on the market, with a mil spec MIL-STD-1474D reading of 117dB when used in conjunction with the Gemtech M4-QD suppressor and an M4 Carbine, and 114 db with the SRT Hurricane on an identical weapon. (reference: Paulson 1997 Silencer Trials, Report BR-71). Other attributes: it is more accurate than M855 ammunition at 50 meters. Tumbles within 2-3" on soft tissue, producing a large wound channel. It does not use fillers which tend to clog suppressors. The ammunition intentionally does not cycle the action, for the ultimate in quiet shooting. 63-gr. Sierra Match projectile.

 

Engel Ballistic Research, Inc.
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