I plugged a smallish doe w/ a pretty conservative load from my Redhawk and it punched right through w/ minimal if any expansion.
https://www.24hourcampfire.com/ubbth..._mag_300_XTP_on_smallish_sli#Post5627786 Not ideal for deer, but I found her so it wasn't "wrong" either!
That vid reminded me to pull her out and give her a workout!
Early in my handgun hunting career I shot a buck w/ a 240 XTP and a stout load of H-110 and he got away even in spite of a half day of tracking; my first lost deer ever. A real confidence-destroyer. Badly placed shot though.
I need to test them in gallon jugs of water just to see how they expand. Certainly need chrono testing is in order... To say nothing of FIELD testing!
