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| .338 Whisper | ||
|---|---|---|
| Type | Rifle, subsonic | |
| Place of origin | USA | |
| Production history | ||
| Designer | J.D. Jones | |
| Designed | 1990s | |
| Manufacturer | SSK Industries | |
| Specifications | ||
| Parent case | 7 mm BR or .221 Fireball | |
| Case type | Rimless, bottleneck | |
| Bullet diameter | .338 in (8.6 mm) | |
| Neck diameter | .360 in (9.1 mm) | |
| Shoulder diameter | .457 in (11.6 mm) | |
| Base diameter | .463 in (11.8 mm) | |
| Rim diameter | .466 in (11.8 mm) | |
| Rim thickness | .048 in (1.2 mm) | |
| Case length | 1.47 in (37 mm) | |
| Ballistic performance | ||
| Bullet weight/type | Velocity | Energy |
| 200 gr (13 g) BT | 1,077 ft/s (328 m/s) | 515 ft·lbf (698 J) |
| 250 gr (16 g) BT | 1,040 ft/s (320 m/s) | 600 ft·lbf (810 J) |
| 300 gr (19 g) BT | 1,050 ft/s (320 m/s) | 735 ft·lbf (997 J) |
| Test barrel length: 12" Source: Cartridges of the World 1 |
||
The .338 Whisper is a wildcat cartridge in the Whisper family, a group of cartridges developed in the early 1990s by J.D. Jones of SSK Industries.1 Unlike the smaller caliber cartridges in the Whisper family, loads for the .338 Whisper are mainly limited to subsonic velocities. 2
Contents |
Versions
There are two versions of the .338 Whisper:
- The original .338 Whisper is based on the 7 mm Remington Bench Rest case, necked up (enlarged) to take a .338" bullet. As the 7mm Bench Rest and .308 Winchester cases share the same case head dimensions, conversion to .338 Whisper from a rifle previously chambered in .308 Winchester (or any cartridge based on the .308 Winchester case, such as .243 Winchester, .260 Remington, 7 mm-08 Remington, etc...) is a relatively simple task. 3
- The second version (called .338 Whisper #2 by SSK) is based on the .221 Remington Fireball case, simplifying conversion of firearms chambered in 5.56x45mm or its commercial counterpart, .223 Remington. 3
Subsonic
A subsonic cartridge is designed to fire its bullets at velocities slower than the speed of sound (1128 ft/s at 70°F) to avoid the sonic crack caused by the bullet breaking the sound barrier which contributes in large part to the overall noise produced when using a firearm. Subsonic loads are often designed to avoid the turbulent transonic zone entirely. This allows the cartridge to be sound suppressed relatively easily. To ensure terminal performance at subsonic velocities, heavy bullets for the caliber (250-300 grains) (16.20-19.44g) are desirable.
Trademark
"Whisper" is a registered trademark of SSK Industries. In order to sidestep this branding (and/or any licensing fees required to use the "Whisper" name legally), other manufacturers tend to use different names for cartridges in the Whisper family. For example, the .300 Whisper (the most popular cartridge of the family) is often called ".300 Fireball" or ".300-221".
See also
References
- ^ a b * Barnes, Frank C. (2006) [1965]. Skinner, Stan. ed.. Cartridges of the World (11th Edition ed.). Iola, WI, USA: Gun Digest Books. pp. 252, 284. ISBN 0-89689-297-2.
- ^ http://www.lasc.us/RangingShot338WhisperRevisited.htm User "Review" on the .338 ammo
- ^ a b http://www.reloadersnest.com/frontpage.asp?CaliberID=389 Information on the two different whisper versions
External links
Wikipedia content modification information:
- This page was last modified on 28 May 2008, at 16:40.
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