I have been shooting and building muzzleloaders for 10 to 12 years or so. I find that they are the larger challenge that most other forms of shooting except maybe to "2 Mile" matches. The longest distance I have shot my 45 caliber under hammer slug gun is 600 yards and with ladder type tang sights it is about 1.5 MOA with pure lead cast bullets and 110 grains of Goex FFG. It was made about 8 years ago and usually shoot it a time or two a year. My favorite is a 50 caliber heavy barreled match gun that was made in 1950 by a fellow named Web Terry who even after he died in 2011 still holds national records at Friendship IN.
John