I prefer to use fixed broadheads myself, but We have taken 2 of 3 bull moose with mechanicals .I've heard lots of guy's say not to use them for anything larger than deer but each guy has his own opinion and obviously they are just that OPINIONS because we have 2 moose that say they'll work on very large game as well.Not that I'd change my mind but I do know that mechanicals do work.I think mechanicals are much better now than when they first come out and it's probably why some hunters just don't trust them. I know they work but I can't help but think when I use them that's when one blade won't open properly and I'll injure or lose a animal ,so I will stick to cut on contact or fixed .
But mechanical's do work.For each his own.

nubo