Thread: Which is louder, a 12 or 410 bore.

I found this info

I found this at a site on hearing loss:

SHOTGUN NOISE DATA (DECIBEL AVERAGES)
.410 Bore, 28" barrel 150dB
.410 Bore, 26" barrel 150.25dB
.410 Bore, 18" barrel 156.30dB

20 Gauge, 28" barrel 152.50dB
20 Gauge, 22" barrel 154.75dB
Data: freehearingtest.com

Remember sound pressure levels measured in DB use a logarithmic scale. The 2.5 dB increase, w/ 28" barrels, from a .410 to 20 is significantly more than a linear interpretation of 1.6% might lead one to believe.
zippy13 is offline

From Here It is from 2011 though