You would be surprised how an old good shooter can be returned to being a good shooter rifle simply by re crowning the barrel.
What the magic is for that last fraction of a second that a bullet leaves the barrel is as opposed to the first 22 - 24 inches, I cannot tell you, but if the lands are re cut and square the magic often returns to make the gun accurate again. Usually only a 1/16 of an inch is all it takes to get back to good accuracy.
But suggesting that the shooter is generally more accurate than the gun, that is pure ego.
Drewski
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