7mm lrm help.

[kfreeze]

I am thinking about building a custom 7 lrm. I was hoping someone could tell me how the barrel life of that round compares to the 7 rem mag, 7-300 win mag, and 7 mashburn super mag.
I was also wondering if anyone has ran 168 bergers in the lrm and what they got for speeds?
Any help is welcome.