If your not restricted to conicals only as in some areas of the country, there are sabots also to try. They might shoot very well out of your rifle. I would suggest some 240 & 300 grain Hornady XTP's with about 90 grains of loose powder. They should do well.

Also, since you have a CVA Hunterbolt, I will guess that some powerbelts will also do very well out of the rifle. I shoot a 245 grain out of my CVA Staghorn Magnum with excellent results.

The there are Lyman Maxiball, REAL conicals, Hornady Great Plains conicals... all of them might do real well out of your rifle. All you can do is try them.