223 ammo test. If you want to fire 5.56 NATO ammo through your ... To compare apples to apples, I selected two factory loads from Winchester, both of which are loaded with a 55-grain FMJ projectile.

223 ammo test. If you want to fire 5.56 NATO ammo ... both of which are loaded with a 55-grain FMJ projectile. However, muzzle velocity and downrange energy will vary depending on your bullet ...