Hawkeye - I have the T/C Hawken and it is a GM LRH barrel withdovetailed fiber optic sights.
The front sight measures 0.450" high (from the barrel flat). The 240 gr bullets are shooting about 6" high.
Now using the same load, and shooting 275 gr Maxihunters or 320 gr REAL bullets, I have to raise the rear sight. (90 - 100 gr of FFFg).
I was under the same opinion that you were too with the heavier bullet shooting higher. But it doesn't seem to be the case here for some reason. That is why I was asking if anyone shot the 240 and 300 XTPs side by side.