Shot the Ruger today. I confirmed that (ahem) one can run faster speeds than factory 7.62x39's. The load was within book, but it's going quite a bit faster than factory - like say 250 fps faster.
It seemed to do better with Hornady 123gr SST's, which measure .3104", versus Sierra 125's, which measure a true .311". Last 3 shots were in a 1/2" at 100 yards with the Hornadys. It's ready to kill a deer.
I'll likely do some more load development with it over the next few weeks. May even try some 150 gr in it.
The load 
