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Assuming both the 40 and 60 grain are actually subsonic (the projectile does not break the sound barrier) and both have similar muzzle velocities, you should expect the 60 grain to be louder. It...
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Assuming both the 40 and 60 grain are actually subsonic (the projectile does not break the sound barrier) and both have similar muzzle velocities, you should expect the 60 grain to be louder. It...