The Barnes #3 manual doesn't list a load for Varget with the 308 Win and a 150 gr X bullet but does with the XLC bullet.
308 Win 150gr X-bullet with IMR 4064 = 41.0gr to 45.0 gr
2634fps=2891 fps
300 RUM 180gr X-bullet H-1000 = 86.0gr to 91.0gr / 3047-3224 fps
RL22 = 79.0gr to 84.0gr / 3136-3334 fps
RL25 = 84.0gr to 89.0gr / 3170-3359 fps
IMR4350 = not listed
Retumbo =not listed
I hope that helps you BC you owe me I had to go out in the cold Brrr to get my manual /Hal