I would agree that 26" barrels would seem handier on a 450/400.

I guess it depends upon the action and weight/taper of the barrels to achieve the desired balance.What size action is your Hollis based on--a 20 gauge sized action like a 500 NE or smaller? What would be the best sized action for a 450/400 with 26" barrels? What would be a "best" combination giving a lighter weight as well for a 450/400 class rifle?