Has any one tried the new Barnes MRX bullets? Maximum Range X-Bullets.

I have some in .308 x 180 grains. I think I'll try to get my old AI ought six up to about 2850 fps with these. They are a "Non-lead" core (looks like lead) and solid copper X concept in the front half and the TSX rings in the shank. Pretty cool looking. I like the design. It seems very tough and should hold together well. I'll try them this week. Now where did I put my H4350.....?