What I found was that the 17gr Vmax and TNT bullets start to fragment after about 1/2" of penetration. The fragmentation is quick, and complete. Both bullets pretty much completely disintigrate within the fist 2" of penetration, with small shrapnels of copper jacket being left behind. It appears the bulk of the damage from the bullet appears at a depth of 1.5-2". The heavier shrapnel and fragments of both bullets continue through to 3" of penetration, although the TNT fragments are larger. The Vmax bullet has a slightly thicker base that penetrates slightly further than the TNT bullet to a depth of about 4". Both bullets are completely fragmented.
The 20gr XTP bullet is slower to expand. It appears to start at about 1" and be completely expanded by the time it reaches a depth of 2". After that it continues penetrating to a depth of about 5" but there is not much distruption past 2", it pretty much just punches a small hole. The XTP bullet really does mushroom like a big game bullet and stays intact.
Wet phone book material is perhaps 25% more dense than small game flesh according to my testing. So in real animals you'd see a little more penetration than my testing shows.
In summary, on small game, I would expect the 17gr bullets do a lot of damage to a depth of 1 to 3 inches and a small base penetrates to about 4 maybe 5 inches. The 20gr bullets expand like a miniature big game bullet within the first 2-3 inches but mostly just punch a small hole to a depth of about 6 maybe 7 inches.
