There is always someone at a gun club....saying he's so good ...all he shoots in his gun is "threads"...( no choke ) ...because it cramps his style to use a choke ...
Some of those guys have talent.../ but mostly they are just the guys - that no one wants to shoot with - or listen too.../ and every club I've ever visited has one guy like that - that you can hear from 100 yds off...
Don't be one of those guys...
Buy a full set of choke tubes.... Cylinder, Skeet, Imp Cylinder, Mod, Improved Mod and Full...and shoot the chokes that put a 30" pattern on the target at the expected kill range..( and I know there are other chokes in between the ones I mentioned - like Light Mod, etc )...but those 6 chokes will do anything I need done with a shotgun.
---------------
The shot will probably stay in the wad as it travels down the barrel...so in theory "shooting threads" will only plug up the threads with plastic fouling..so it may not ruin the barrel...but I don't care if you paid $ 150 or $ 5,000 - or more - for your shotgun /it was still your hard earned money ...why the heck would anyone just abuse their equipment...
--------------
Same loudmouth might shoot Full chokes for Skeet too....because he's so good, he wants to see them powdered all the time...is what will be coming out of his mouth .../ when usually he just chips his way to mediocrity .../ where a good Skeet shooter might powder a lot of targets ...shooting a Skeet choke if he centers the targets...!
I'd rather be shooting the right choke ..for the job at hand.../ and not abusing my equipment...