I agree with Borkon, too close to the edges. I shoot the same bullet at 3700 out of my 6mm-204 and as long as I stay away from the edges it works. When a bullet enters and expands and sends a shockwave radiating out through the animal, you can see it in slow motion photos in ballistic jell the whole block bulges out as the bullet expands. If you get too close to the edge the shockwave will break out/through the skin
A splash usually doesn't penetrate into the body just splashes on the surface. Yours left a softball sized crater an inch or so lower it would have been a perfect example of a NBT doing its job.. I shot a whitetail buck at 8' with a Rem corelock 150gr 308 and was stunned when he didn't go down, no blood just hair on the ground. I tracked him in the snow for about 60 yards and saw some blood, the blood trail got stronger but you could tell he was coughing up the blood. I finnally found the deer and the nearside of the deer had a wound the size of a dessert plate like someone has taped and M-80 to his side with zero penetration. when I gutted him a couple of jacket fragment had penetrated between ribs to tear up part of the lung, he drowned in his own blood. Usually you don't find them to see what happenned.