Today I chronographed a Barnes 130 grain X bullet at 2702 fps out of my 1994 SB1 30-30 Handi. This was the first time I have done so with no pressure signs showing up. I chronographed identical other rounds at 2694 and 2690. I might be on to something here and will keep you posted. According to other Barnes data and articles, I should be able to easily do that with the XLC'x and the TSX's
My supply of the old style XBT's without the shoulder is just about gone so I think I'll experiment with the newer offerings in the future.......Chainsaw