My 24" m70 is currently running 2,960fps with 165gr.SST's and 2,745fps with 180gr. SST's.
The 165's are .540" for 5 and the 180's are running .645".
I'm more than happy with that rifle & only see the .300WMag as a "plinking" rifle at this time, for playing a the range on the steel gongs.