The .510 Whisper (13×47mm) is a subsonic rifle cartridge developed by SSK Industries for use in suppressed rifles. It is capable of firing a .51 caliber bullet weighing at roughly .

Overview

The .510 Whisper (13×47mm) is the second of two rounds developed by

J. D. Jones J. D. Jones (born November 21, 1936) is an American firearms and cartridge designer, firearms writer and founder of SSK Industries. Jones began hunting at an early age, and became interested in bullet casting and handloading firearms cartridge ...

with a specific focus on the Thumper concept and subsonic use. Based on the .416 Rigby case, it is a non-belted and bottlenecked cartridge. Earlier

had already developed the similar .500 Whisper round, which has a roughly longer belted bottlenecked case based on the .378 Weatherby Magnum. Despite the large bullet, this round is very quiet when using a

suppressor A silencer, also known as a sound suppressor, suppressor, or sound moderator, is a gun barrel#Muzzle, muzzle device that suppresses the muzzle blast, blast created when a gun (firearm or airgun) is discharged, thereby reducing the sound inten ...

due to the subsonic nature of the cartridge. When used with a very high ballistic coefficient bullet, the round only loses about out to over . This gives it more downrange energy at that distance than traditional .30 caliber rounds such as the .308 Winchester and .300 Winchester Magnum.Whisper cartridges
" by Lukas Kruesi, ''New Zealand Guns & Hunting'', September/October 2003 Sako TRG-S test rifles have achieved

minute of angle A minute of arc, arcminute (abbreviated as arcmin), arc minute, or minute arc, denoted by the symbol , is a unit of angular measurement equal to of a degree. Since one degree is of a turn, or complete rotation, one arcminute is of a tu ...

, and better, accuracy with this cartridge at . Powders such as H110, 4227, or surplus WC820 are well suited for subsonic loads and give a low

standard deviation In statistics, the standard deviation is a measure of the amount of variation of the values of a variable about its Expected value, mean. A low standard Deviation (statistics), deviation indicates that the values tend to be close to the mean ( ...

. Necessary components such as barrels, reloading dies, etc. are available from SSK.

Sako Sako Limited (natively ) is a Finnish firearm and ammunition manufacturer located in Riihimäki, Tavastia Proper in southern Finland. It also has owned the Tikka brand of bolt-action rifles since 1983, and is now owned by the Italian firear ...

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 bullets.

Design

The case of the .510 Whisper is based on the .416 Rigby (same as the .338 Lapua Magnum) as the parent case. Overall length of the loaded round is about .

References

{{DEFAULTSORT:510 Whisper Pistol and rifle cartridges Whisper cartridges Subsonic rifle cartridges

Overview

Design

See also

References