SAAMI has accepted several new rifle cartridges, including the 6.8 True Velocity Composite which pushes a 150-grain bullet to the velocity of 2,700 fps. You can check part of the layout in the schematics above. Hornady’s 6mm GT is another one as well as Weatherby’s 338 WBY RPM.

SAAMI @ TFB:

• SAAMI Announces Acceptance of Three New Cartridges from SIG Sauer, Weatherby and Winchester
• True Velocity Join SAAMI’s Board of Directors as a Voting Member
• 6mm Advanced Rifle Cartridge (6mm ARC) – New Mystery SAAMI Accepted Cartridge
• [SHOT 2022] Beretta & True Velocity Confirm Partnership & Announce Civilian RM277

Here is Hornady’s 6mm GT.

You can find a link to cartridge and chamber designs newly accepted by SAAMI here.

Here is the announcement from SAAMI in full:

NEWTOWN, Conn. – The Sporting Arms and Ammunition Manufacturers’ Institute,® Inc., (SAAMI®) has announced the acceptance of three new rifle cartridges for SAAMI standardization. SAAMI is the organization at the forefront of promoting firearm safety by creating standards that ensure the safety, reliability and interchangeability of firearms, ammunition, and components.

6mm GT – The 6mm GT was introduced by Hornady Manufacturing Co. with a 109-grain bullet traveling at a velocity of 2,910 fps and a Maximum Average Pressure of 62,000 psi.

6.8 True Velocity Composite – The 6.8 TVC was introduced by True Velocity Ammunition, LLC with a 150-grain bullet traveling at a velocity of 2,700 fps and a Maximum Average Pressure of 65,000 psi.

338 Weatherby Rebated Precision Magnum – The 338 WBY RPM was introduced by Weatherby, Inc., with a 225-grain bullet traveling at a velocity of 2,800 fps and a Maximum Average Pressure of 65,000 psi.

For further information on these new cartridges, please visit the New Cartridge & Chamber Drawings section of the SAAMI website.

About SAAMI

The Sporting Arms and Ammunition Manufacturers’ Institute, founded in 1926 at the request of the federal government, is dedicated to creating and promulgating technical, performance and safety standards for firearms, ammunition and components, and is committed to being the preeminent global resource for the safe and responsible design, manufacture, transportation, storage and use of these products.

Which new cartridges do you think will be a hit?