Dave, the 200 gr Partition wasn't the problem, and I wouldn't expect it to be, there's no moss on that bullet. The one we had trouble with was the 240 gr Woodleigh, similar in length to the old 200 gr X bullet, that never would shoot well in any of the rifles I had at the time. Whether or not they would shoot in my 1:8 Kreiger, who knows, I don't have any left, and a 20 pound rifle isn't suitable for the kind of hunting or defensive situations I get myself into anyway. Surprisingly, the 240 gr Woodleigh 1.43" long, is not that much longer than the 180 gr TSX 1.390". It might even be that the close range testing I did reflected the precess as the bullet exited the 1:12 muzzle, but whatever the reason, a bullet that is already in yaw at impact, can't penetrate as well as one that impacts closer to nose on, and then yaws, and is spinning fast enough to recover from the impact induced yaw.