I've still hunt with muzzle loaders for many years with no concern. An Omega is about as safe as you can get with the hammer un-c0cked. You've got to be a lot more careful with sidehammer guns when busting brush. I usually leave the hammer on half c0ck, but sometimes put a double patch over the cap and let the hammer rest on that cushion. As always, safe gun handling and knowing where that muzzle is pointed is #1.

I have a Leupold VX-II 2x7 on a Browining 1885 45-70 and a 3x9 on a B-78 25-06, and just looked through both of them. At 20 yards the difference in field of view is noticable, but not enough to be important in a hunting situation.