I am interested in purchasing this ammo in 64 gr. Does anyone have any experience with this ammo in deer hunting or as a self defense round. Muzzle velocity is listed @ 3020 fps. It is advertised to mushroom to double the original diameter. I have killed deer (live weight) with a 223 55 gr soft point previously back in Missouri. Here in Tennessee the deer are much smaller. I am looking for a round that can double both for deer hunting as well as a defensive round. Thanks for your input.