I'm not good with computers, so I can only hope that the two pictures I intend to post do appear as I want.
The first is me at the 2019 York Shoot. That is the last one I attended. My chunkgun (pictured) is a left-hand percussion, .50 caliber, with a 46" heavy barrel. The rifle weighs 16 pounds. Competitors are supposed to dress in 1920's - 1930's style. Most simply wear bib overalls, but some go all the way.
The second photo is the shooting line at the 2017 York Shoot.
All shooting is done prone, resting the rifle over a "chunk" which are mostly homemade now days, but could be simply a short length of log.
In years past there were over 200 competitors, but in recent years the numbers have dropped some. I don't know about this year's number.