.510 Whisper
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 750 gr at roughly 1050 ft/s.
Also recorded as .510 Førland
.510 Whisper
- Name
- .510 Whisper
- Field
- rifle cartridge
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Documentary evidence
Documentary basis
Authority files
wikidata · Q4545399 · wikipedia · .510 Whisper
In this article
Key facts
Key facts
• Name —.510 Whisper • Origin — USA • Type — Rifle • Designer — SSK Industries • Parent —.338 Lapua Magnum • Case Type — Rimless, bottleneck • Bullet —.510 • Neck —.549 • Shoulder —.587 • Base —.587 • Rim Dia —.588 • Case Length — 1.865 • Length — 3.34 • Bw1 — 750 • Btype1 — AMax • Vel1 — 1050 • En1 — 1837 • Balsrc — SSK Industries, Ammo.org
Overview
Overview
The.510 Whisper (13×47mm) is the second of two.50 in rounds developed by J. D. Jones 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 J. D. Jones had already developed the similar.500 Whisper round, which has a roughly.4 in longer belted bottlenecked case based on the.378 Weatherby Magnum. Despite the large bullet, this round is very quiet when using a suppressor due to the subsonic nature of the cartridge. When used with a very high ballistic coefficient bullet, the round only loses about 100 ft/s out to over 500 yd. 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 minute of angle, and better, accuracy with this cartridge at 600 yd. 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 gr bullets.
Design
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 3.34 in.
Primary material
Documents and archives
authority record
- Wikidata, structured authority record Q4545399:.510 Whisper
General reference · Wikidata
reference work
- “.510 Whisper”, English Wikipedia, consulted as further reading
Reputable secondary · Wikipedia
Text attribution
Licensing
Text attribution
Part of the biographical narrative on this page reuses licensed material. Its origin, revision and licence are recorded here.
The biographical narrative on this page is based on the Wikipedia article .510 Whisper, revision 1274432278 (EN edition), by its contributors. VALÉORINE has edited that text and built its own documentary record around it. The reused material is available under CC BY-SA 4.0, and this page's reuse of it is offered under the same licence. Everything else on this page — the chronology, the holdings, the evidence, the plates and the connections — is VALÉORINE's own record. Sources and licences.
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Broader subject
1- rifle cartridgeTerminology
Established from a fact already recorded on a verified source.
The Encyclopedia exists whether or not anything is for sale. Corrections are recorded rather than overwritten, and every version of this record is kept. Published 16 August 2026.
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