Re: favorite muzzle brake?
I'm not sure if it fits your definition of "tactical" but the Holland brake is VERY effective at reducing recoil and muzzle flip (everyone that's shot my 300WM with brake is blown away at how little it moves when fired) and it has no holes on the bottom if you're worried about "dust signature". Holland claims measured 40% reduction in recoil, in my case I would say that's WAY conservative. I have no idea how well it doubles as a flash hider (some brakes make claims in this area FWIW).
John