Don't use one of those simple weighted dB meters. Use an RTA (real time analyzer) in an unweighted setting. It will give you a frequency spread (1/3 octave is an ISO standard) and the highest frequency crest is what it will use for the dB reading. Using weighted meters is pretty much useless, as they will alter the spectrum (bell curve) and not all people hear the same.
If you have the cash, the Audio Control SA-3050 or 3055 is fine, or you get get any one of a number of brands for use with a laptop or PC.
Then, you can see in real time how chnages to a gun will affect it's real world sound in both frequency and level.
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Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.
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