Totally wrong
I shoot a .308 AAC Cyclone on a 11.5" M16 over a .223 silencer because as a left handed shooter the greater volume of the .308 silencer and bore diameter reduce the amount of blow-back into my face from the ejection port.
The Cyclone due to it's larger volume is quieter than the smaller .223 silencer.
Now if given the exact same volume silencer then the oversized bore would cause less sound reduction.
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