Your not going to touch more power without going to a heavy revolver or a Desert Eagle. There's the S&W Mt guns and Nightguards which will be lighter than an all steel revolver but I think the 10mm is stil a good way to go. Only advantage a revo would give is that (at least for me) while pissing down my trousers at the sight of a big bear coming at me I can't linp wrist a revo. You might look into some 400 Corbon or .45 Super conversions, not really sure how those stack up to the 10mm. Also the .50GI deserves a look but I'd be ok with some hardcast Buffalo Bore 10mm
If you want to go for heaviest hitting, light weight has to go out the window and start looking at the S&W X-Frames, Ruger Alaskans & Super Redhawks etc.