Cape buffalo are shot with 458 solids. No explanation. Deer are lot smaller than Cape buffalo. For years I have been shooting deer with 400 fn cast bullets started ar 2000. Deer seem to go right down. All deer are different. Some a little tap and they go hooves up. The next one you can blow a soft ball hole in their chest and they run for a mile. Next batch I load will be closer to 1600fps. Recoil is getting a bit much.