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This OSR phenomenon that's referred to. Is it visible down the length of the barrel? If so, I have a hard time accepting that it's caused by the bullet. Even a "hard" bullet like a mono solid. You take a solid copper bullet, banded or otherwise. When that sucker hits the rifling in a considerably harder steel barrel, it will swage down to bore dimensions in pretty short order. Metal has to move period, or it would be a bore obstruction. Once the initial swaging is done, I fail to see how it could act on the barrel any differently than any other bullet, for the remainder of it's trip down the bore. Fire a conventional solid, and a monometal solid down the same bore, and measure them. See if there's a difference in the land/groove dimensions?
Jeff
The doubles I have seen with OSR (4-5), including one of my own, begin to exhibit the OSR about 8-10 inches down the barrels and the OSR continues to the muzzle. It appears where the barrels are beginning to taper down. There is too much steel in the chamber end for it to show. The more severe the OSR the further up the barrels it will begin.
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Re: OSR, Double Damage and Barnes' Response