First off welcome to the forum. You have one great rifle there. I am sure it will give you years of service.

As for the load, everyone I talked to says the 250 grain Shockwaves. They like to push them with about 120 grains of loose or 150 grains of pellets. I think this is one of those rifles that is made to shoot large charges, accurate.

I would start with 250 grain Shockwaves. I would use 110 grains of Triple Se7en 2f or 120 grains of Pyrodex RS. You might also want to try some Hornady 300 grain XTP's and see how they fly for you also. Keep us posted as what turns out to be the best load for you.