Hi, I load the Barnes X in my 375 H&H and it goes off at about 2800fps.

Had the same thing happen on a few hits. The bullet would just take a very strange path.

What I think is happening, and this is just a though is that the "x" is opening up and has one leaf opening slightly ahead of the others.

I don't think it's speed, because it only happens occationally. On one of them it looked like the bullet core was off center.