IMO, the 10.5 lbs weight is not out of line for a 450- 3 1/4" BPE! Almos all my hunting rifles are in the 10 lb range, except my little Merkel 9.3X74R, which weighs in at 8.5 lbs, and my 500/450#1 express weighs almost 10 lbs,with 28" barrels, and it is a BLACK POWDER EXPRESS, yet it handles like a BB gun! A 10.5 lb double wouldn't worry me at all, just makes it easier to work up a regulating load, by reduceing recoil!