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The main factor is mass. When recoil begins, the greater mass of the rifle means greater inertia, which means it takes longer for the rifle to begin detectable recoil. Since velocity times mass of the rifle equals velocity times mass of the bullet, the higher velocity and lower relative mass of the bullet means it is usually out of the barrel before the inertia of the rifle is overcome and recoil begins. So the recoil movement of the rifle will have no effect on the bullet point of impact.
Jim
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