I'm posting some pictures of Andy's rifle for him. As anyone familiar with them can tell, it is a Green River Rifle Works Leman Indian Rifle. These full stock versions are a lot less common than the half stock GRRW Leman Trade Rifle.
This model was developed by Phil "Blue Jacket" Sanders in 1974. He copied an original Leman rifle from Doc White's collection. The prototype or concept rifle that Blue Jacket built recently re-surfaced in Vernal, Utah.
This picture is a little blurry, but those are British proof marks on either side of what appears to be the caliber stamp.
The rifle has quiet a bit of wear in spots, but I think it gives it character. It certainly wasn't a safe queen. At least, Andy won't have to worry about babying it.
There are several aspects of the stock that indicate to me that this is a kit rifle rather than one made in the factory. The most obvious one is the cheek rest treatment.
We don't know for sure, but I'm guessing that this sticker was placed on the butt stock by the proof house. The 230 gr., 0.535" round lead ball, 0.015" patching would likely be the proof load. The "65-120 gr. FFg Black Powder" notation would be the recommended range for shooting loads. These numbers don't agree with GRRW's published proof load or their recommendations for .54 caliber "Light Load of 100 gr.", "Moderate Load of 140 gr.", and "Maximum Load of 175 gr.", so I don't think it would be from a dealer.