Among all the calibers used for the AR-15, the 6.5 Grendel is the best in business. The weapon is known to hit hard and performs exceptionally well to 1000 yards. It is the perfect suit for hunting and also ties with the 5.56 as the most versatile round. For instance, let us imagine that you’re going to hunt a deer. At this time, you have to use the 223 Remington, which can load bullets around 55 grains.