Thread: History of the .300 Whisper now known as the .300BLK.

Yes there have been many advances in this technology since this article was written with softer light weight lead hollow points such as Roberts and pre cut expanding copper bullets like the Lehigh Defence bullets etc.

The whisper cartridges were designed to shoot very long heavy bullets through a fast twist barrel and were marketed to kill by tumbling on impact.
These days this school of thought has been lost and guys run all sorts of bullet weights and designs through their BLKs with often average results.
Even the Military are using 1-7" twists with 220gr SMKs instead of the 1-8" twist and 240gr SMK this cal was designed around.

The original .300 whisper used 17" long suppressed Shillan barrels had a 1-8" twist rate which shot the 240gr SMK extremely well and also shot the 125gr nosler ballistic tip equally as well which was the choice for the supersonic loading at the time.

Modern Blackouts now mostly use a 1-7" twist which dont shoot the new trend of mid weight subs or light weight supers anywhere near as well as the old Whisper rifles did with the 240gr and the 125gr.

You have to keep in mind that this article was written by Lucas who at the time was selling Whispers under licence by JD jones in USA.
The late JD fought and protected his right to the invention to the end but due to military involvement and new SAAMI specs and he was walked over and the cal was no longer a wildcat.

Ive owned three of Lucas's rifles over the years, all Remington 788s which were a common platform to build on then, two in .300 whisper and one .338 whisper. Ive since owned multiple copies and .300BLKs but none of them have shot the 240gr and 125gr as well as his builds did.

I put plenty of meet in the freezer with my trusty .338 whisper and 300gr SMK subsonics. I even put that rifle on paper at 600y during a F class range day with spectacular results.

To add insult to injury and to piss all over JD's grave someone is now releasing an "8.6 Creedmoor" ( .338 Blackout)... yip a cut down 6.5 Creedmoor case necked up to .338cal.

AKA .338 WHISPER which was a 7BR case necked up to .338cal yip... exactly the same.. it shot 300gr subsonic bullets out of a 1-8" twist barrel and supersonic 160gr to 2600fps.
Notice the constant reference comparing it to the .338 Federal and no reference to the fact its just a .338 Whisper. AKA .338BR... the very same wildcat round that's been around for 20 years.

https://kitbadger.com/8-6-creedmoor-vs-338-federal/

I have a 300 whisper,built by Lukas on a CZ 527 varmint.HS Precision stock.cases from 221 fireball.
My understanding of the 240grn matchking is not a tumble,the fast twist is upset on impact to Yaw.

Duh! as in the artical.