Big Ted, I have yet to find any firearm that is leaded that a barrel plugged with Kroil inside won't help. I wish you had someone who was close enough to help out first hand. AS KW said there are so many people that don't even shoot BP that will give advise. I have had several jump in on the SASS and Cas City forums that are telling BP shooters that they only need the soap and water all the time. It was done over a hundred years ago and we have better things to use in this day and time. I think you should try the Kroil if you have not done that yet. The big cases are totally different and that is where I will step away as I have no time with them. KW has years of experience in that area and would be one of my first people to seek out. You might not like his answers but they will the truth.