My wife and I both shoot core-loks in our 270 win and 308. The last two deer we shot had to be tracked for 100 yards with little or no blood trail. I accuse her of shooting blood less bullets. I want to try something else.
Allen, can you share a little more of the story on those bad experiences with respect to the distance of the shots, and how those particular shots hit in terms of anatomy and line?
That link with the transparent deer showing the major bones and anatomy are a very important concept to teach novice hunters and folks who have not done much field dressing or butchering.
When I have guided young kids with no background, I have them visualize what I called "the basketball".
We talk about how chaotic and difficult shot placement can be by describing the anatomy, and we make up an imaginary "basketball" that sits inside the front of the chest with a little margin from the front, top, and bottom and sides.
They have to pretend to "see all the way through the deer/elk", not just the surface and fur. This way, when they don't get a perfect broadside, the head on and quartering shots do not throw them off.
Then I have them imagine "extra points" for hitting a "baseball inside that basketball" and to do this for all the frontal angles.
We talk about holding off on the quartering-away shots and the going-away shots, due to the obstructions of all the internal parts blocking that basketball.
If they hit the middle 1/3 of that basketball, we generally get a DRT. If they barely get it in that basketball, as in a double or single lung, we might have to track for as far as those amped-up deer/elk can run for about 30 - 45 seconds, (which can be far). If they just nick a lung, I will have a long day....
Personally, my guess is your story will be of a lung, or double lung shot. I have seen some huge mule deer and elk take it right through the heart with 7 MAG and run a long way while dead on their feet, so I don't think your story sounds like it was all that bad.
So what were the details of those shots?