Since the 1377 can be converted to .22 _very_ easily and will use the exact same powerplant, is one caliber gonna be inherently quieter than the other?

 just a little, no difference.....

dr_subsonic's pneumatic research lab

the Lunatic Fringe of American Airgunning
Southwest Montana's headquarters for Airgunning Supremacy
Proud Sponsor of team_subsonic

but it all depends on how much air is being expelled and how long your barrel is , etc et

"i never was much for book learnin"

the rest is pure 1377..... ok, maybe not "pure", but its a 1377 driving it

dr_subsonic's pneumatic research lab

the Lunatic Fringe of American Airgunning
Southwest Montana's headquarters for Airgunning Supremacy
Proud Sponsor of team_subsonic

it will be quieter, alot of the smart phones now have DB meter apps.

"i never was much for book learnin"

i have a smart fone. Of course, its smarter than I am.....

 

EDIT: found a couple from the 'droid market. Freebies. I'll test and report

dr_subsonic's pneumatic research lab

the Lunatic Fringe of American Airgunning
Southwest Montana's headquarters for Airgunning Supremacy
Proud Sponsor of team_subsonic

...the charge to expand more completely and thus exhaust at a lower pressure (all part-in-parcel with delivering more energy to the pellet), .22 will be at least marginally quieter.

Steve

it would given up a lot of energy beofre the pel exits the muzzle.

 

eh, I'm learning

dr_subsonic's pneumatic research lab

the Lunatic Fringe of American Airgunning
Southwest Montana's headquarters for Airgunning Supremacy
Proud Sponsor of team_subsonic

in my humble opinion,hee hee, it will depend on many variables....pell weight, pumps, weather/air conditions. but generally i have found that the 177 is louder due to the faster velocity of the pell and the smaller aperature of the barrel.