I have a beartooth magnum, which is an optima under
another name plate. I would try 2-50gr. 777 pellets.
That works great for me with 225gr. aero-tip powerbelts.
I tried combinations using 50gr. & 30gr. but mine likes
the 100gr charge best. Very accurate, very easy to load,
very easy to clean. Please post your results. Will look for
them.