The military has used it for years. They called it Battle Sight Range.
All of my hunting rifles are set for MPBR. I use a 4" kill Zone for Varmints, 5" Kill Zone for Predators, a 6" Kill Zone for deer, and an 8" Kill Zone for Elk.
I hand/re-load for all of my centerfires and chronograph all of my loads. I even chronograph 22 Rimfires so I can set MPBR for the round I use for hunting.
