The drop dead in their tracks '''''usually''''' occurs in two cases,, extreme hydraulic shock, or bullet placement that takes out both shoulders, or the neck/spine.
To get the extreme hydraulic shock you need a supper fast light weight varmit stile bullet that explodes after interning the ribs,, this can also be achieved using a long range bullet, at short ranges, where it fails (comes apart) before leaving the carcass due to it's high impact speed.
Now this would or could cause you problems, if your shot hits a leg before interring the vitals, it could blow up before reaching the boiler room.
The shoulder shot destroys too much eating material, although the neck shot destroys little, it also gives you the possibility of a fast moving target, if the deer turns it's head, the spine shot is just a small target.
I shoot them behind the shoulder, then go get them. I know it's a pain, but it is also a very dead deer and I get to eat it all
You might want to try some Ballistic tips,, they come apart a little easier than the silvertips, but not much