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Using a borrowed rifle in Norway, I didn't really notice the difference. However it is claimed the animals have trouble placing the direction of the shot. Must have some reduction in the muzzle and noise as well, except I couldn't hear any real difference. Never tested in out intentionally or systematically though. Of course the sonic crack will still occur with high velocity rounds.

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The one on the 7x64 you used reduces the sound by about 28db IIRC. Had you tried it one shot with, and one shot without, you would have noticed the difference.