In and out were simply holes much the same size..I can tell you from what I have seen the hydro`s seem to have "IT" as say a hard Nosler Part or so would have drilled straight through and NOT done what the hydro did imo.
I have shot a mature sambar stag through both shoulders with a Nosler Partition out of my 300 WM and he kept going for another couple of 100 or so,I would lay dough on it that the same shot would have walloped him on the spot using a hydro

I shot this bumpy head on Fri evening with a Hydro out of my .358 Norma Mag..way overkill of course but there was only 1 % meat damage...basically a tunnel,they must produce tremendous shock.
Had a chance to take the hind but couldn't hold well enough on her from a very uncomfortable possy so I let the chance go,these deer were only 5-600 from the car hence the shot.

I hear Federal in the US are very impressed with them..oops maybe thats a secret haha.

About 200 miles from E/Gipp K

I snapped this pic of a big young stag under one of his preach trees last week and would have loved to have drilled him with the 358 Hydro in the shoulder but I`m waiting on his sire.