.510 Whisper

Infobox Firearm Cartridge
name= .510 Whisper


caption=
origin= USA
type= Rifle
service=
used_by=
wars=
designer= SSK Industries
design_date=
manufacturer=
production_date=
number=
variants=
is_SI_specs=
parent=.338 Lapua Magnum
case_type=Rimless, bottleneck
bullet=.510
neck=.549
shoulder=.587
base=.587
rim_dia=.588
rim_thick=
case_length=1.875
length=3.34
case_capacity=
rifling=
primer=
max_pressure=
max_cup=
is_SI_ballistics=
bw1=750
btype1=AMax
vel1=1050
en1=1837
bw2=
btype2=
vel2=
en2=
bw3=
btype3=
vel3=
en3=
bw4=
btype4=
vel4=
en4=
bw5=
btype5=
vel5=
en5=
test_barrel_length=
balsrc= SSK Industries [http://www.sskindustries.com SSK Industries homepage] ] The .510 Whisper was developed by SSK Industries to shoot .510 (.50 BMG) bullets in a suppressed rifle. "Cartridges of the World" cite book | last = Barnes | first = Frank C. | editor = Skinner, Stan | title = Cartridges of the World | edition = 11th Edition | origyear = 1965 | year = 2006 | publisher = Gun Digest Books | location = Iola, WI, USA | pages = 282,| isbn = 0-89689-297-2] The case is based on the .338 Lapua Magnum cut down to convert|1.885|in|mm. Neck wall thickness is reduced to convert|0.013|in|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.

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 convert|100|ft/s|m/s|abbr=on 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." [http://www.suppressor.co.nz/whisper.htm Whisper cartridges] " by Lukas Kruesi, New Zealand GUns & Hunting, September/October 2003] SAKO TRG-S test rifles have achieved MOA and better accuracy with this cartridge at 600 yards.

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 convert|950|gr|g|sing=on bullets.

ee also

*Whisper Family of Firearm Cartridges
*List of rifle cartridges
*12 mm caliber

References