No, I haven't changed a thing. The only thing I thought about is the day before I shot the rifle the weather conditions were wet and cold. Lots of snow and freezing rain. Condensation? Thanks for your comments.Have you changed powders, solvents, lubricants, or any such item?
The white stuff was only on the front surface. I don't think blow back is a factor. The residue cleaned up real easy. ThanksThe only time I ever saw that was when I was shooting Pinnacle or APP powder. When you see it in the breech plug.. could that be blow back past the plug? Might be time for a new plug.