RE: CVA OPtima-- amxi ball or power belts
I guess it comes down to your personal preference and what your gun likes. Every gun is a little different.
As mentioned with that barrel twist - it' s set up nice to shot PB, sabots, etc. I have had pretty good consistency w/ 295 gr HP from Powerbelt. I' ve also heard a lot of guys that like it slightly heavier - i think there is a 348gr (not sure on the exact number)