ML matches

[mherth]

The long range ML matches have me intrigued. Which caliber, bullets, and powder charges are most common?
Likewise, are there Official ML round ball matches? What is maximum distance? Offhand, bench, or sticks?
Many (most?) of us BPCR shooters started out by shooting muzzle loaders. I am interested in returning to those beginnings. Seems like life was so much simpler, and less expensive!