Introducing .277 Wolverine, 5.56 meets 6.8 (VIDEO)

The crew at Mad Dog Weapon Systems have put together a promising new wildcat cartridge, the .277 Wolverine. The cartridge uses 5.56 NATO and .223 Remington brass along with 6.8mm Remington SPC bullets to produce a cartridge that’s philosophically the same as 300 AAC Blackout but serves a different purpose.

It’s the same in that the only difference between a 5.56 rifle and a .277 Wolverine is the barrel. The bolt, receiver and magazines are all 5.56/.223. But with a larger .27-caliber bullet, a gun chambered for .277 Wolverine is better-suited for hunting and possibly for self-defense, as the larger impact surface is potentially more likely to expand than fragment, depending on the bullet design. Unlike 300 BLK it’s not a dual-purpose round with a sub-sonic side.

They have a full line of components to build a gun chambered for .277 Wolverine, including ARs and bolt-action rifles, along with loading dies to make cartridges. While production ammo isn’t available just yet, there is enough interest in .277 Wolverine to make it a reality in the future.

To help early adopters there is also a working .277 Wolverine forum.


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Charles is the editor for 248 Shooter a midwest based gun news and gear review site as well as Online Content Director for On Target Magazine. He is an avid student taking classes from top tier trainers around the country. Charles shares his love for training as well as experience and opinions on some of the most talked about gear and products used by competitive shooters, military, leo and civilians.