For those curious, my Akela so far seems to like the jsb 18.13 best, and the runner up surprisingly is the H&N Baracuda Match 21.14 gr. Is there anything I can do to tweak it a little better for the H&N? What would be the best velocity for the H&N 21.14? I currently have the power on the rifle set to fire the JSB at 925fps, and haven't clocked the H&N yet. Sorry for the rookie questions, but do different pellets have a optimum velocity that it is most accurate at? Basically, I want to know how to tweak the rifle for specific pellets, if that's even a thing.. 
The tope two rows are 30 yards, the rest at 50. Shooting prone with a bipod.

The tope two rows are 30 yards, the rest at 50. Shooting prone with a bipod.