I will explain something: yes, you can use Hyper Beam, and hey, with a Lonely(or maybe adamant still works) nature, It might be a great lure to a physical wall (not that I can currently think of one). But hyper beam is still that, Hyper Beam. Sure, it has STAB, but unless you OHKO thier last poke with it, it isn't great. It gives the opponent a turn to setup, or OHKO Salamance. It is best to go full physical or an odd full special lure, but mixed doesn't always work. Also, Physical is desired because without 1(or 2, i don't remeber) speed boosts with dragon dance, scarf Mamoswine will out speed and OHKO revenge kill Salamance. :P
Ps, also Salamance gets a lot better coverage with physical moves. The Flying-Dragon-Steel Coverage isn't great, a better one wold be Flying-Rock-Ground, and then a Move like Dragon Dance.