I have a Pedersoli Mortimer Whitworth muzzleloader in .451 It launches a 525gr gun bullet. On hand I don't remeber the velocity or charge. When I purchased the muzzleloader I had a specialist manufacture a bullet mould specifically for that barrel. The gun groups 3/4moa consistently with bullets from this mould. The sights are long range peep sights which are great for target shooting, but really difficult to hunt with. I stand to be corrected but believe that competitors shoot up to 1000yards with this model and variations of this model.
I am fairly new to black powder hunting & shooting, but am exceptionally happy with the quality and craftmanship of this gun. Probably the only critism would be the trigger pull which is fairly easily rectified.
I attached a photo of a recent hunt where I shot a warthog at 60 odd yards. With a bit more time at the range I would not hesistate to shoot an animal at 200 yards with this setup.