The Topper Deluxe Classic(TDC) stock has a bit more clearance at the spacer for the chamber swell of the TDC barrel, otherwise it has pretty much the same barrel channel as other stocks, it will fit fine on rifle barrels, I have two of them, one on the 405Win(rebored 38-55) and the other on a 44mag.
Tim
I just measured both TDC forends, they're the same average width as other forends, pallet wood and laminated, ~1.6"-1.7".