264 win. Velocity with hammers ???

[tribb]

This may have been posted before I'm not sure I looked and couldn't find it. I'm looking for input on expected velocities in a 264 win Mag with a 26" bartlien 8 twist barrel using Hammer bullets 124 grain Hammer hunters and 134 grain stone hammers. Wondering also if it will be usefully faster than a 6.5 PRC? Thanks for your help. Tribb