We talked about the .300 AAC BLK (7.62×35) last week and for a comparison we are looking at the 7.62x40WT The New 7.62x40WT uses the 5.56x45NATO cartridge case which is shorten and necked up to the .30 (7.62) caliber projectile. To convert the standard 5.56NATO AR-15 platform rifle, a barrel change is required and… Read More »Wilson Combat 7.62x40WT