.510 Whisper
From Wikipedia, the free encyclopedia
| .510 Whisper | ||
|---|---|---|
| Type | Rifle | |
| Place of origin | USA | |
| Production history | ||
| Designer | SSK Industries | |
| Specifications | ||
| Parent case | .338 Lapua Magnum | |
| Case type | Rimless, bottleneck | |
| Bullet diameter | .510 in (13.0 mm) | |
| Neck diameter | .549 in (13.9 mm) | |
| Shoulder diameter | .587 in (14.9 mm) | |
| Base diameter | .587 in (14.9 mm) | |
| Rim diameter | .588 in (14.9 mm) | |
| Case length | 1.875 in (47.6 mm) | |
| Overall length | 3.34 in (85 mm) | |
| Ballistic performance | ||
| Bullet weight/type | Velocity | Energy |
| 750 gr (49 g) AMax | 1,050 ft/s (320 m/s) | 1,837 ft·lbf (2,491 J) |
| Source: SSK Industries [1] | ||
The .510 Whisper was developed by SSK Industries to shoot .510 (.50 BMG) bullets in a suppressed rifle. "Cartridges of the World"[2] The case is based on the .338 Lapua Magnum cut down to 1.885 inches (47.9 mm). Neck wall thickness is reduced to 0.013 inches (0.33 mm) and a small shoulder is cut into the body for head spacing. Over all length of the loaded round is about 3.34 inches when using surplus bullets.
[edit] Overview
Despite the large bullet, this round is very quiet, similar to the noise from a .22 Short. And with a very high ballistic coefficient, the round has only lost about 100 ft/s (30 m/s) out to over 500 yards. This gives it more downrange energy at that distance than traditional .30 caliber rounds such as the .308 Winchester and .300 Winchester Magnum.[3] SAKO TRG-S test rifles have achieved MOA and better accuracy with this cartridge at 600 yards.[2]
Powders such as H110, 4227 or surplus WC820 are well suited for subsonic loads and give a low standard deviation. Necessary components such as barrels, reloading dies, etc are available from SSK. Sako TRG-S actions are most often converted to this caliber. The Thompson Center Encore is also suitable, but is rather lightweight for shooting this heavy recoiling cartridge, especially when using 950-grain (62 g) bullets.
[edit] See also
[edit] References
- ^ SSK Industries homepage
- ^ a b Barnes, Frank C. [1965] (2006). in Skinner, Stan: Cartridges of the World, 11th Edition, Iola, WI, USA: Gun Digest Books, 282,. ISBN 0-89689-297-2.
- ^ "Whisper cartridges" by Lukas Kruesi, New Zealand GUns & Hunting, September/October 2003
