I have an Optima and the load you were going to try is a perfect start. First, powerbelts work well with CVAs (obviously) and the 100g pellets won't push them very hard. I prefer the 295g powerbelt myself.

After your eyes stop watering after shooting those $1+ powerbelts and want to try loose powder. My optima likes 90g of 777 and 300g xtp mag. Good luck and have fun!