Jsb 33.95MK2 Best Velocity in ST Barrel

I am using 33.95 mk2 in my royale 500 at 860fps. I have not been able to test different velocities with this pellet. I would like to know what are the best velocities for this pellet in ST Barrel specifically in Royale 500. Do i need to lower the velocity or is it just fine.

Looking forward to everyone's response. Cheers