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Scratch---The time between shooting and cleaning those guns was about 2 hours and it was a very dry day so I don't know how much moisture could have been absorbed. I figured if anything there may have been some oil left in the bore that bonded to the residue from the AP powder. All I can say is water and waterbased solvents would not remove the residue, I had to use Butch's bore shine (standard version) and a bronze brush to get it out of the barrel. In the adds they state plain water will remove the residue so I figured some type of reaction with oil must have occured. I also noticed a white/gray residue on everything just from the unburnt powder.