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<blockquote data-quote="rustyshackleford" data-source="post: 2461172" data-attributes="member: 59526"><p>Again, look at pewscience. The scale he uses is a safe exposure scale. Not a dB scale. It quantifies the one fact you laid out that is correct: no suppressor is safe for very high volume, at least for supersonic rifle cartridges. This is clear in his rating system which takes into account exposure intensity and duration. According to osha you are taking your braked 7 mag from probably 165 dB down to maybe ~145 dB with muffs and plugs. Doubling up ear pro only adds 5 dB reduction even if it's 33 NRR muffs with 30 NRR plugs. A suppressor does a better job. If you want to be safe get a suppressor and shoot with plugs. </p><p></p><p>As to you friend saying the crack is the problem with semi autos it's not. The bolt is unlocking while the system is still pressurized to a point. That hot gas venting right next your ear is the problem. Even a 300 blk sub has that and is probably similar is exposure to a bolt action with super sonics suppressed due to the close proximity of the origin to your ear. The higher the residual pressure when unlocking, the louder.</p></blockquote><p></p>
[QUOTE="rustyshackleford, post: 2461172, member: 59526"] Again, look at pewscience. The scale he uses is a safe exposure scale. Not a dB scale. It quantifies the one fact you laid out that is correct: no suppressor is safe for very high volume, at least for supersonic rifle cartridges. This is clear in his rating system which takes into account exposure intensity and duration. According to osha you are taking your braked 7 mag from probably 165 dB down to maybe ~145 dB with muffs and plugs. Doubling up ear pro only adds 5 dB reduction even if it’s 33 NRR muffs with 30 NRR plugs. A suppressor does a better job. If you want to be safe get a suppressor and shoot with plugs. As to you friend saying the crack is the problem with semi autos it’s not. The bolt is unlocking while the system is still pressurized to a point. That hot gas venting right next your ear is the problem. Even a 300 blk sub has that and is probably similar is exposure to a bolt action with super sonics suppressed due to the close proximity of the origin to your ear. The higher the residual pressure when unlocking, the louder. [/QUOTE]
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