I was reading in Gun Test Reports on a comparison of bore cleaners. They had Shooters Choice, Sweets, BMG 50 and a few others. They gave highest honors to BMG 50, which is fairly new. I have some, and it does work great! However, the ammonia smell is as strong as i've ever smelled
The interesting thing is that they placed copper jacketed bullets in each solution and weighed bullets before and after soaking. The bullet in BMG 50 had slightly lower weight than the remainder, suggesting copper removal rates were higher in this solution.
I suggest BMG 50 whenever your in the market for a new bottle of bore cleaner!!!
Of course, its hard to beat a solution of equal thirds of marvel's mystery oil, odorless kerosene, and acetone for effectiveness and low cost.