According to the Buckskinner Barrel Chart the rifle has a 1:38 twist. Note.. that chart is not always 100% accurate. Since it appears that the rifle is a faster twist rifle, it would not surprise me that a 240 grain T/C XTP would not be an accurate load. Whether 100 grains or 80 grains is the sweet load, only a trip to the target range will answer that for you. You should be in the ball park with 80-100 grains, but you really need to shoot the rifle to learn it... Good luck.