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Ok, the 2771 is the Muzzle Velocity of the Bullet, and 0.628 is the size of the group, in inches, at a hundred yards (most likely).
They are changing brands of powder and the amount to change not only the final velocity of the bullet, but also the pressure curve while it is leaving the barrel. Fast burning powders will spike the pressure very quickly, while slower powders will have a smoother curve. Somewhere between the extremes is the optimal pressure curve to achieve a desired velocity.
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