Yes there is a printed reference to using the Mercury method of gun barrel Lead removal. It is in the "Shooters Handbook" by Richard Arnold published by Nicholas Kaye Ltd. London. Though now out of print, like a lot of interesting books on guns and shooting. Process is described on page 21 section three. It is a pity you folks reside on the other side of the pond I do have a spare pound or two of Mercury. Purchasing it here is a little restricted but not impossible to purchase, it sometimes appears on e-bay for sale though often collection only.
