Thanks guys, the shot was a good one considering I was not on the bench. I try shooting from the bench as much as possible because I just can't keep very steady. This one took me a bit of concentration, but in the end I got lucky and it placed well.
I am wondering if you are able to decrease your speed a little and see what kind of expansion you get. I do think that the "bullet hits the bone" is probably a factor here. but who knows.
I did want to talk about the always talked about and oh so important, to some, ..........Energy Dump!!! Personally, I don't buy it, at least not most of the time. When I started air gunning I bought some H/N Hornets. Man, those things are Wicked!! Like a Polymag on steroids. The ultra sharp brass tip just cuts right through and opens up the way for the lead behind it. So I shot a squirrel once, it was coming down the side of the tree giving me a perfect side profile shot. I took it and that pellet sailed right on through the side of the vitals and kept on going with enough energy left to have probably killed 2 more if they were lined up. That squirrel just arched in place and fell to the ground never to move again. I have also seen on YouTube where Mexican hunters have shot deer with a .22 Marauder, probably at around 40ish fps, and it just jumped like it got stung by a bee, walk two yards or so and tumble like it was drunk, then just fall over not to move again. While I shot a doe once with a 50 Cal Muzzle Loader at 40ish yards broadside to quartering and dang thing ran 100 yards before it gave up the ghost.
I think that the important thing here is being able to disrupt a major vital process in the body. Does not matter if that's the brain, heart, lungs, or a combination of those.