The .300 HAM'R is a centerfire rifle cartridge designed by Bill Wilson of Wilson Combat. It was introduced to bridge the performance gap between the 5.56 NATO and .308 Winchester. The .300 HAM'R is based on the .223 Remington/5.56 NATO case, but it has been modified to accept .30 caliber bullets. This cartridge delivers enhanced terminal ballistics and superior knockdown power compared to the 5.56 NATO, making it more effective for hunting medium-sized game such as deer and hogs.
The .300 HAM'R can be used in standard AR-15 platforms with just a barrel change, making it a versatile option for AR-15 enthusiasts. It is capable of pushing bullets weighing between 110 and 150 grains at velocities ranging from about 2,450 to 2,980 feet per second. The cartridge is praised for its balance between power and recoil, providing improved energy transfer while maintaining a manageable recoil, making it suitable for both tactical and sporting applications.
Overall, the .300 HAM'R offers a compelling option for those seeking a high-performing, versatile cartridge that can be used in an AR-15 platform for a variety of shooting purposes.