I haven't tried the VLD's, but the classic hunter 7mm. Shot my buck last fall at 50yrds, impact vel was at least 2900. He was 1/4ing away the bullet poked through the 1st rib took large parts out of the next 2 ribs, ripped the bottom off both lungs deflated the heart (think empty sack). and every artery in his chest was cut. I found 1 piece of jacket in the off side shoulder, with no exit. That's what I expected with a high impact velocity. He stumbled around in circles for about 5sec which is to be expected without taking out CNS, or bone structure.
I suspect that for what ever reason the tip opening may have been a touch to small to allow for proper expansion. What you can do is go through your bullets trying to insert a small paper clip or a large staple in the tip, and set aside those that the paper clip will go in for hunting. I do this for the warm fuzzies.

Or which I really doubt you got a box of target VLD's in a box coded for hunting.
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Keep in mind the animals we shoot for food and display are not bullet proof. Contrary to popular belief, they bleed and die just like they did a hundred years ago. Being competent with a given rifle is far more important than impressive ballistics and poor shootability. High velocity misses never put a steak in the freezer.
Joe