ALOT of USPSA / IDPA shooters go through 20K in pretty close to about a years time.
That is 100% correct !!!! I've shot IPSC/Action matches for 20+ years and did use to shoot twice a week practice { 300/500 rds. centerfire } and at least 500 rds. of .22rf each visit , then I shot a match on EVERY weekend { apx. 200/250 rds. } and for 10 years , I ran a IPSC match on a weekday { apx. 150 rds. } -- add in the extra Bowling Pin Shoots , 3 Gun Action , Steel Challenge {LOTS of AMMO } and SASS/Cowboy Action and I've shot over 50,000 A YEAR !!!! YES -- I DO Reload and cast my own bullets !!! LOL
My Jimmy Clark Sr. PinMaster .45acp has 20,000 rds. thru it more then once --- never replaced anything other then recoil springs { every 5000 rds. or so } , mag release spring {once } and the 3 leaf mainspring {also only once }.
My McArthure Colt Delta Elite 10mm has over 40,000 rds. thru it and again , only had some springs replaced.
My Ruger MK2 .22rf has WAY OVER 50,000 rds. thru it and I've never replaced ANYTHING on it.
Revolver wise --- both my Main Match Cowboy guns { Uberti Thunderers } have over 20,000 thru each along with my "back-up" pair !!! My custom S&W 610 10mm 5" has over 20,000/30,000 thru it and has not had anything replaced. And my S&W 29 pin-gun has at least 15,000 "hot" pin loads thru it with nothing needing to be replaced.
Maybe I'm just "lucky " !!!! ---- LOL