RE: OK MY WIFE IS RIGHT AGAIN!!
whether it shoots powerbelts, only the rifle will know for sure. My Black Diamond Xr for instance only does a moderate job with powerbelts. That rifle I would shoot some 200 & 250 grain SST's for taking game. If I had to shoot a conical it would be a 460 grain No Excuse Conical.
by the way, congratulations on your new rifle.... it sounds like a dandy.