Unclenick, what are your thoughts on this Optimum Barrel Time theory:
http://www.the-long-family.com/OBT_paper.htm
http://www.the-long-family.com/OBT_paper.htm
How much did the muzzle diameters change?I have run hoop stress analysis to determine what the waves might do to muzzle diameters and concluded that in some barrels they may contribute to the velocity flat spots you find shooting an incremental load string.