The monkey wrench in your question is that it is a subjective one.
Assuming all guns are shooting 30 fpe,and out of the box, it would be hard to find one as quiet as a Air Arms ERB, (have not heard the BSA Super ten with factory shroud). Air rifle makers are getting more savvy with making their guns with factory shrouds that really cut the noise like the FX whisper, and some DayStates.
Now if you go to "modville" the sky is the limit. People like PAG and AZ and others are putting on after market shrouds that IMO are the ultimate in quieting. A Theoben Rapid with one of these afer market shrouds is at or near the top in quieting but the gun by itself is near the sound of a rim fire when fired with just a bare barrel end.
Another thing I have found is that my shooting environment might be accoustically worse or better than yours causing me to think my rifle is the most quiet or not. My Rapid is a kind of like the sound of a blast puff of air but when I get afield it litterally sounds broken its so quiet.
When I shoot my Air Arms TDR shooting 14fpe and shooting it with a thingy on the end, well now you are talking click quiet where ever I am. That little rifle is a joy to shoot and part of that joy is the lack of sound when I fire it.
Hope this helps.
Desire without knowledge is not good, and whoever makes haste with his feet (or air rifle), misses his way.
..probably no difference. Shroud is a big one chamber silencer if the end is closed in to near pellet diameter. Shroud does rely on the barrel as a structual part of it's construction, and there are those taht argue that that makes it legally different from a silencer.
with a big can on it,but no matter how big that can is there is no way on earth it will be close to the quiet of that pumper I showed. About the best your going to do with a Career is a muffled airnail gun sound.
I purchased a BSA scorpion with permanently fixed moderator recently from AOA. Cylindrical baffles in this moderator keeps it silent, you can't screw it off the barrel but can unscrew the moderator cap to clean the baffles. 31 ft lbs, average velocity 937(6 fps spread)at 200 bar, .22 cal, and I just love it.
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