I finally taped the end of the barrel and let some gasoline soak the bore for an hour or so, I ran a brass brush down it every now and then too. The gas did soften the cosmoline so that I get more out when I brush it with Hoppe's now. I may have to soak it for a day or two to get it really softened up or find some brake cleaner like Streetglideok says. Firing those few rounds must have toasted it. I am supprised that it did not remove it like leading is removed by firing a jacketed bullet. Thanks for the info, I will keep working on it.