The bullet retained 60 of 64 grains...hardly "grenaded" in my opinion. One guy, two bullets and one dead deer. I'd not give up so easily.
The first pic is a groundhog killed with the 64 BSB. The second pic is the exit hole. Far from an exploding bullet IMO.
I expect the damage upon entrance was due to frontal diameter. The bullet is fairly blunt.
Here is a pic of the bullet sectioned. I did this as soon as I grabbed some to see what they looked like inside. I doubt they'll blow up easily.