Hunting can be so unpredictable, even with great bullets & what we call perfect hits. Some animals just don't accept the fact that they are dead on the spot, it happens. Hang around hunting long enough & you'll see it happen with no explanation in sight.
Probably the best, or maybe the worst example I can relate is a guy that shot an Idaho Pronghorn 7 times with a 7mm magnum.
The first shot looked good & was an exit, the next 6 were just brutal & yet it kept running, why? We were just spectators but it was a sad event to watch with no answer that we could come up with. Cast or premium, sometimes it just doesn't make any sense how they react.
Jeff, reconsider, we all need to keep these discussions open & going, hopefully no one gets too worked up over some one else's opinion. There's 2 ways to get experience, listening to those that have it & are willing to share it & also by getting out there & getting in the trigger time. Good hunting!

Dick