SAAMI Accepts and Standardizes Two New Cartridges

Both 8.6 Blackout and .25 Weatherby RPM are now SAAMI-approved cartridges.

by
posted on February 15, 2026
** When you buy products through the links on our site, we may earn a commission that supports NRA's mission to protect, preserve and defend the Second Amendment. **
SAAMI approves 25 Win. RPM and 8.6 BLK

The Sporting Arms and Ammunition Manufacturers' Institute (SAAMI) recently announced the acceptance of two new rifle cartridges for SAAMI standardization. Since its founding in 1926—at the request of the federal government—the organization has created the industry standards that ensure safety, reliability and interchangeability of firearms, ammunition and components.

8.6 Blackout

The 8.6 Blackout—with the SAAMI abbreviated name 8.6 BLK—was introduced by Q, LLC. It was standardized with a 200-grain bullet traveling at a velocity of 2,200 fps and a maximum average pressure of 62,000 psi. The cartridge is based on the 6.5 Creedmoor, with the case shortened and neck widened to accommodate a .338-inch-diameter bullet. 

Kevin Brittingham established Dover, N.H.-based Q LLC in 2016. He brought decades of experience to the venture, having founded Advanced Armament Corporation (AAC)—a cutting-edge suppressor design and manufacturing firm—in 1994. He sold that company to Remington Arms in 2009 and consulted or worked for major manufacturers in the industry before once again striking out on his own.

.25 Weatherby Rebated Precision Magnum 

The .25 Weatherby Rebated Precision Magnum—with the SAAMI abbreviated name .25 WBY RPM—was introduced by Weatherby with a 133-grain bullet traveling at a velocity of 3,000 fps and a maximum average pressure of 65,000 psi. The cartridge is based on the .284 Win., but the case is lengthened and neck diameter reduced.

The Weatherby name is, no doubt, a familiar one among readers. It was founded in 1945 by Roy Weatherby in California. His rifles and wildcat cartridges quickly gained the attention of enthusiasts, along with an A list of Hollywood stars. The company, which celebrated its 80th anniversary last year, moved to the more Second Amendment-friendly clime of Wyoming in 2019. It remains family owned with a third generation of Weatherby at the helm.

Latest

attack in a back alley
attack in a back alley

Cold Performance: How to Prepare for the Uncertainty of Self-Defense

Defensive gun use is defined by uncertainty. You don’t know when it will happen, how far away the threat will be, how many threats you will face or what position you will be in when it begins.

Derya Goes Silent: The OBone Suppressor

In 2025, Turkish manufacturer Derya Arms opened a new facility in Florida, enabling the company to produce a number of new products domestically, such as its new OBone suppressor.

The Armed Citizen® Oct. 26, 2026

Read today's "The Armed Citizen" entry for real stories of law-abiding citizens, past and present, who used their firearms to save lives.

Rifleman Q&A: Understanding a Firearm's Cycle of Operation

The cycle of operation is the mechanical sequence of events that it takes to fire one shot out of a firearm. If one of those steps fails to take place as designed, there is an interruption in the cycle of operation and the gun stops firing.

Review: Sightmark Pinnacle 1-6x24 mm Riflescope

Looking for a performance LPVO without the usual associated cost? The Sightmark Pinnacle 1-6x24 mm might be your answer.

Myths & Misunderstandings About the “Modern Fighting 1911”

The Colt Model 1911 pistol and its derivatives are among the most iconic military handguns ever made. But in 2026, does the M1911 still hold up as a quality defensive arm?

Interests



Get the best of American Rifleman delivered to your inbox.