Well, my muzzle loader has the factory trigger, and while I have no idea what the pull weight is since I've not had it measured, it is way to heavy for me. That said, I don't use them enough to have a trigger job done on them.
On my main hunting rifle, I have the trigger set at 2.5lbs which I feel is safe, but still decently light.
That said, I normally prefer a much lighter trigger around 1lbs, but my current hunting rifle isn't that light.