"I have read that oil left in the bore will cause wrinkles in the steel as the first bullet passes down accumulating that oil in front and by hydraulic action from the pressure of a fluid...."
Regarding oil left in the barrel: Who has not fired two shots before sighting his rifle, or going hunting to get the oil out of the barrel? I push a 2x4 through it but have not always done so. That very thin protecting film clinging to the bore after weeks or even one day can never cause hydraulicing as there is no obstruction ahead of it; so plastic deformation in the barrel steel caused by the supple copper shanks of the bullet will be very unlikely.
Oil in the chamber is a much more dangerous liability.
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"I have read that oil left in the bore will cause wrinkles in the steel as the first bullet passes down accumulating that oil in front and by hydraulic action from the pressure of a fluid...."
Regarding oil left in the barrel: Who has not fired two shots before sighting his rifle, or going hunting to get the oil out of the barrel? I push a 2x4 through it but have not always done so. That very thin protecting film clinging to the bore after weeks or even one day can never cause hydraulicing as there is no obstruction ahead of it; so plastic deformation in the barrel steel caused by the supple copper shanks of the bullet will be very unlikely.
Oil in the chamber is a much more dangerous liability.