The .510 Whisper is a subsonic rifle cartridge developed by SSK Industries for use in suppressed rifles. It fires a .50-caliber bullet weighing gr ( g) at roughly ft/s ( m/s).
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| - The .510 Whisper is a subsonic rifle cartridge developed by SSK Industries for use in suppressed rifles. It fires a .50-caliber bullet weighing gr ( g) at roughly ft/s ( m/s).
- Despite the large bullet, this round is very quiet, similar to the noise from a .22 Short when used with a suppressor. When used with a very high ballistic coefficient bullet, the round has only lost about 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. SAKO TRG-S test rifles have achieved MOA and better accuracy with this cartridge at 600 yards.
- |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | .510 Whisper |- |- ! style="padding-right: 1em;" | Type | colspan="2" | Rifle |- ! style="padding-right: 1em;" | Place of origin | colspan="2" | USA |- |- |- |- |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | Production history |- ! style="padding-right: 1em;" | Designer | colspan="2" | SSK Industries |- |- |- |- |- |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | Specifications mm ) mm ) mm ) mm ) mm ) |- mm ) mm ) |- |- |- |- |-
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| - |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | .510 Whisper |- |- ! style="padding-right: 1em;" | Type | colspan="2" | Rifle |- ! style="padding-right: 1em;" | Place of origin | colspan="2" | USA |- |- |- |- |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | Production history |- ! style="padding-right: 1em;" | Designer | colspan="2" | SSK Industries |- |- |- |- |- |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | Specifications |- ! style="padding-right: 1em;" | Parent case | colspan="2" | .338 Lapua Magnum |- ! style="padding-right: 1em;" | Case type | colspan="2" | Rimless, bottleneck |- ! style="padding-right: 1em;" | Bullet diameter | colspan="2" | in (mm ) |- ! style="padding-right: 1em;" | Neck diameter | colspan="2" | in (mm ) |- ! style="padding-right: 1em;" | Shoulder diameter | colspan="2" | in (mm ) |- ! style="padding-right: 1em;" | Base diameter | colspan="2" | in (mm ) |- ! style="padding-right: 1em;" | Rim diameter | colspan="2" | in (mm ) |- |- ! style="padding-right: 1em;" | Case length | colspan="2" | in (mm ) |- ! style="padding-right: 1em;" | Overall length | colspan="2" | in (mm ) |- |- |- |- |- |- |- |- |- |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | Ballistic performance |- style="text-align: center; font-size: 90%; background: #DEDEDE;" cellspacing="0" cellpadding="0" ! Bullet weight/type ! Velocity ! Energy |- style="text-align: center; font-size: 90%;" | style="vertical-align:middle; border-bottom: 1px dotted #aaa; " | gr (g) AMax||style="border-bottom: 1px dotted #aaa; "| ft/s (m/s) ||style="border-bottom: 1px dotted #aaa; "| ft·lbf (J) |- style="text-align: center; font-size: 90%;" |- style="text-align: center; font-size: 90%;" |- style="text-align: center; font-size: 90%;" |- style="text-align: center; font-size: 90%;" |- | colspan="3" style="text-align: center; padding-top: 5px; font-size: 90%;" | Source: SSK Industries |} The .510 Whisper was developed by SSK Industries to shoot .510 (.50 BMG) bullets in a suppressed rifle. "Cartridges of the World" The case is based on the .338 Lapua cut down to 1.885 inches. Neck wall thickness is reduced to 0.013 inches 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.
- Despite the large bullet, this round is very quiet, similar to the noise from a .22 Short when used with a suppressor. When used with a very high ballistic coefficient bullet, the round has only lost about 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. 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 bullets.
- The .510 Whisper is a subsonic rifle cartridge developed by SSK Industries for use in suppressed rifles. It fires a .50-caliber bullet weighing gr ( g) at roughly ft/s ( m/s).
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