Well you're off to a good start with the idea of reading the manual. Loads of tips, and good information in there.

I think they must be a quality rifle. People that purchase them sure like them. I have handled them but in all honesty, I did not like the shape of the stock. Too old fashion I guess. While they are a magnum rifle, shooting magnum charges is not always the most accurate, but all of this you will learn in time.

I read posts where they like powerbelts, XTP's even shockwaves. So it sounds like you have a lot of things to try. Start with about 80 grains of loose powder with some of the different bullets out there and work up from there. Most of the rifles tune in around 90-110 grains of powder. I have a CVA Staghorn Magnum. 90 grains of powder and that rifle is good to go.

Good luck with your rifle. Take care and be safe.