CB Shorts are killers but placement is key. Some guns with LR chambers will shoot shorts OK to Wow, but mostly not. My suggestion, since there are now available CB Longs and CB LR ammo, if you have a LR chamber use that stuff...if your rifle doesn't do well with shorts.
Carbon ring theory...yes, maybe. Clean the chamber after shorts and move on. Many years ago I had a LR chamber that suffered some chamber pitting due to short ammo and my ignorance. YMMV
Shorts in a "short chamber" shoot as well as most anything else fired in the appropriate chamber:
CCI CB shorts, 50 yards, bag rest w/Weaver 4X RF scope. Groups a few thou over .5". The gun will do the same with CCI short HVHP ammo.
The rifle, 20" barrel, 1:16 twist, short match chamber from Fox Ridge:
Zeroed for hogs at 10 yards, fired in numerical sequence, clean barrel, offhand leaning on post.
Hogs. If you cannot be patient and precise, wear good track shoes. If you intend to shoot a sow with the kids in tow, shoot her first. Know where you're heading in case things don't go as planned...every time you do this.
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