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Old 07-25-2013, 07:29 AM
JFR JFR is offline
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Join Date: May 2013
Location: FL
Posts: 175
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Good question,

My phone has a sound meter app I think I'll run it at the next range visit. I'm thinking add 5-10db for being in a hallway scenario.

This chart doesn't list .40 but it will give you some idea....

FreeHearingTest.com - Gunfire Noise Levels
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