.277 Wolverine
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A picture showing a comparison between various cartridges, such as the .277 Wolverine, 6.8 SPC and 5.56 NATO.
The .277 Wolverine (6.8×39mm) is a wildcat cartridge based on the 5.56x45mm NATO round and was designed by Mark Kexel of Mad Dog Weapon Systems in 2014. It is a versatile mid-powered cartridge with better ballistic performance over the AR-15's traditional .223 Remington / 5.56×45mm NATO chamberings. Converting from .223 / 5.56 to the .277 Wolverine requires only a new barrel. It utilizes small rifle primers, as well as .277 caliber projectiles (like the similar 6.8 SPC, the .270 Winchester, as well as the highly anticipated .27 Nosler and .277 Fury).
