Done both and ether works well. The kettle can sometimes be a little hard to stabilize temps and up here the 18.5 WSM doesn't like to get real hot, but hot enough. This year I'm going to try this one on the WSM, I've done it a couple of times on the kettle with great success.
http://www.weber.com/recipes/poultry/brined-and-barbecued-turkey-with-pan-gravy
Rich same here.
I just got my 22" WSM in september and hadnt done a high heat cook on it yet. Did a test cook last night to see what it would take to get it up to 350.
I was using 6 lbs of thighs not a turkey so thermal mas will be quite a bit different with a 16 lb bird but i can manage that.
My big questions were if i can get 350 with empty pan or if i need to take pan out all together.
I started with 2 fully lit mini weber chimneys with is 70 briquettes or roughly 3/4 of a standard weber chimney.
I threw it on top of of used Stubbs from my last WSM cook and threw some left over lump from a recent kettle cook on top to light right away.
I assembled WSM immediately and allowed it a few minutes to preheat and let top coals light. (MISTAKE)
It took about an hour to get to 350 and stayed there.
Last nights cook was only about an hour. i was going to let it run to see if the fuel would hold up for a full three hour cook but had some things to do around the house so i couldnt baby sit. i opted for a quick shut down.
So for the thanks giving cook i will change a few things:
1. I will load ring with a full chimney (100 briquettes) of unlit stubbs with a full chimney of lit stubbs on top. I will give the coals a few minutes to breathe.
2. I am going to start without water pan in place to get upper portions of WSM heated up faster. I will put in place once bird goes on. If i dont up get to my desired temp i may skip water pan all together
3. I will fire smoker up extra early to allow long preheat especially if the weather or wind isnt favorable ( last Thanksgiving was 33 degrees and windy) I don't expect that again but i will be ready if it happens.