The 8mm Gibbs is a wildcat cartridge, which means it is not an officially standardized round by major ammunition manufacturers and regulatory bodies. It is based on the .30-06 Springfield case, which is necked up to accept an 8mm (.323 caliber) bullet. This cartridge aims to provide better ballistics and increased performance over the standard 8mm Mauser cartridge.
The 8mm Gibbs is typically used by enthusiasts and hunters looking for a unique round that can deliver higher velocities and energy. Its performance enhancements make it suitable for game hunting, with improved range and stopping power compared to some original military surplus 8mm cartridges.
Because it is a wildcat cartridge, 8mm Gibbs ammunition often requires handloading and may not be readily available commercially. Users typically need to be experienced in reloading and custom rifle modifications to fully utilize this cartridge effectively.
Given its niche status, the 8mm Gibbs is primarily of interest to those looking to experiment with custom ammunition and achieve tailored ballistic performance.