I use a 18 ring all the time in my 22. works great for ribs, chicken, abt any short cooks. I have gotten 9-10 hours burn @ 250° w/ my 18 ring in my 22 wsm. I love my 22 more than my 18.
UW Green Ghost - '74 weber kettle
Big Dude - 26 weber kettle
UW (ultimate weber) - weber performer silver
Big Nasty - 22.5 WSM
BFF - 18.5 WSM
Little Blackie - Mak 1 Star #69
1/2 hp cabelas grinder
5lb lem stuffer.