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

Originally Posted by Happy Jack

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

...........From Here It is from 2011 though

and using a "copy and paste" from your post, ( thank you) I found this, https://tinyurl.com/ycadz9ao which I think may be where it all came from.....

".410 Bore 28" barrel 150dB. 26" barrel 150.25dB. 18" barrel 156.30dB.
20 Gauge 28" barrel 152.50dB. 22" barrel 154.75dB.
12 Gauge 28" barrel 151.50dB. 26" barrel 156.10dB. 18" barrel 161.50dB."

SO as my Laurona is a 28 ", then if I am to believe the "data" the noise difference is not substantial, which suggests that I should use the 12 bore.

As all I know about modern powder shotgun loads can be written on the head of a pin and still leave room for "The Lord's prayer," is is possible that reducing the powder and shot ratio load would reduce the noise? After all the shooting range is less than 30 metres.

I have been looking at clay loads https://tinyurl.com/yc2d2buq

#8	Bird/Clay	1.09 grains	0.09	2.29
#8½	Bird/Clay	0.97 grains	0.085	2.16
#9	Bird/Clay	0.75 grains	0.08	2.03

which are defined as using 8 / 9 shot. Any load suggestions for a smaller powder (ADI AP 70 N) and 8/9 shot load?