I own a Lyman Trade Rifle in .54 caliber. Being a flintlock, I would rate the lock as very good, very fast and a great sparker. I have a RMC touch hole liner in mine. It likes 110 grains of 2f powder for the most part.
In that picture, the "Butch's" bottle is isopropyl alcohol for swabbing the bore of the rifle. The green pump spray bottle is moose milk for spritzing the patches, you can see my cheap little blue patch knife, and the balls are home cast by me. And of course my strip of patch material.
I tried it at 35 yards off a bench rest with roundball. Granted this is 35 yards, but that's an average shot where I hunt. I think out of my blind I would stand a pretty good chance.
This rifle will also shoot Powerbelts pretty good. This large conical would put a world of hurt on anything you shot at with it.
It also shoots sabots real well. Of course this is not any real distance, and I have never shot the sabots at long range. BUT at my hunting range, I would be comfortable shooting at ... say a deer.
The Lyman Trade Rifle is well balanced, easy to handle, and like I said, a real fast lock. I shot a deer with a roundball a couple years back with it. The deer was feeding, but facing me. So when she had her head down, I shot her at 52 yards, through the neck. The ball continued through her brisket, down along her stomach, exited and broke her back leg before it disappeared. The deer never took a step of course. So a .54 caliber roundball will get the job done.