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I'll further muddy the velocity waters by stating that the same rifle and ammo combination can easily have near 100 fps difference in average muzzle velocity across several people shooting it. Bullets shot from the prone position typically leave faster than when shot from standing.
And if the barreled action shooting that ammo was clamped in a fixed mount (like SAAMI tests are), the average muzzle velocity attained in that environment will be faster than that of when people held the rifle. Plus, the standard deviation and spread will be lower, too.
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