It seems crazy but there is some truth to it.
My experience in this matter is specifically with bergers, and sierras. Obviously it varies with the particular bullet, the cartridge, the twist and what part of the animal it impacts.
At close range ( 30-200 yds ) on a soft target sometimes the bullet wont have enough time to fully disintegrate its front half before exiting the animal. It will deform and inflict shot but the wound cavity wont be at its maximum. This is obvious as the exit wound is about 1-2".
At medium range ( 300-600 yds) as the bullets slow down a bit now the pieces of the nose have less forward momentum to deviate from, near the same rotational speed, and more time inside the animal, the wound cavity will bee much larger and can sometimes leave exits in the 4-5" range.
At long range ( >500-600 ), and just above the minimum required speed for expansion, now the bullets dont expand as violently because energy has dropped off quite a bit, but rotational speed is still very high. So nearly 100% of the maximum wound cavity is located inside the animal and this will be evident when the exit wound starts dropping back down to 1-3", or you stop getting exits.
Sometimes this makes people uneasy, but its a very effective way to kill and is why cup and core bullets have the following and the skepticism they do.
Those same people like the performance of bonded bullets or solids better, and their performance makes more sense really.
The faster they go the more damage they do. Much more linear, much easier to understand.
A while back there was some ballistic gel test done to simulate how a bullet expands, and the different wound cavities it created at various speeds inside its effective parameters. Except they used various twist barrels to properly simulate the rotational decay of a bullet fired from a typically loaded round. ( A bullets slows down in FPS much faster than it slows down in RPM. So it has to be loaded in a tighter twist barrel as the MV decreases to accurately simulate a round fired at long range. ) When this was done the distance before the bullet fully opened varied anywhere from about 10" down to about 2".
Ill see if I can find the video. It makes more sense when you see it.