That's a heck of a shot. Nothing but net!! You did your part, and I think the bullet did it's part. Sometimes you never know how an animal will react. I've mentioned this on this forum before, but I shot a deer at close range, (75) yards with my .308 and a 168 SMK. I put it right through the lungs. The deer took off and must have ran 400 yards. I found about 1/3 of a lung about 100 yards from where I shot it and another 1/8 of a lung hanging on a fence that the deer had jumped. I was amazed how that deer reacted after having a round go through the vitals. Deer aren't like people though, they don't know that they've been shot, so they don't just lay down and die until their brain stops processing.
First off congrats on a fine hunt and knowing when to shoot and when not to shoot.
I see nothing wrong with your shot placement at all. It is certainly in the vital zone by a fair margin and on quartering animals, the exit will generally get outside the chest cavity. Generally as well the Liver is clipped which is as good a vital as the lugs.
Only thing I see is that the impact was a little high in the vital zone and with the quartering angle, probably only one lung was punched and high at that.
It always seems that a lung shot deer hit high in the lungs lasts longer then if it is hit lower in the chest.
I also know a simgle lung hit will often result in a longer time for teh animal to expire but they are dead just the same. In situations like this I would have done what you did and just sit and observe the animal. As you said, she was unalarmed so why take the risk of placing a poor shot on an animal that is moving unpredictably as long as they are calm and not moving off.
This bullet performance is why I do not like the smaller SMK's for deer hunting, they just do not have the frontal area to disrupt alot of tissue at these extended range impacts.
I too would recommend the 140 gr A-Max inthis class of round for the reasons Shawn C. stated already.
Personally I like the larger calibers but they are more costly to shoot enough to become truely efficent with at long range.
Looks like you did your job obviously with a fine one shot kill pushing the 1/2 mile marker.
Congrats on fine skills and patients(most valuable aspect to the long range hunter I feel).
Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.