If this is the 24 inch bull barrel thumbhole your talking about, I have it in .243. It is a absolute tack driver with the ammo that i've fed it so far, nothing above 90grs but for fun and long range coyote you don't need anything heavier than that. I've shot factory loads with the 80gr GMX, 80gr TTSX, 80gr Soft points, 90gr E-Tip and about to try the 85gr Speer soft point boat tail and the 85gr Federal Trophy Copper load. The first four listed shot very very well, so much so I in fact was surprised, I put a heavier flat on the bottom synthetic forend on it along with a Limbsaver Barrel De-Resonator ( they go on all of my rifles even sub-moa guaranteed ones ). Not sure if you have seen this or not, I didn't know it until I got the gun that they have a recessed target crown as well. All in all I really like the gun quite well and am very pleased with it's accuracy.