Ok well I ended up using my wsm because I just didn't want to fuss around with adding charcoal here and there in the kettle. I was going to put sand in my smoker but couldn't find the bag I had stored in the shed. Plus its actually warm outside, 31 in the morning and 41 in the after. Put water in the bowl and ran the wsm with all vents fully open. It peaked around 269 for about 2 hours and then dropped to 238ish. Noticed the charcoal wasn't catching consistently. Bought the embers brand from home depot as it was on sale for 2 20lbs bags for $10. Should have bought the kingsford for 2 18lbs bags for 25 bucks. Oh well live and learn. It just never fails everytime I switch from kings Ford I never get the same results.
So butts been in since 750 am and now its 149 at 1100 am.
They don't call me the charcoal nerd for nothing. Kingsford burns differently than RO. It is less dense with more volatiles (crap that burns) so it will "catch" throughout the pile faster. The con is that it won't last as long and will ash snuff more quickly.
RO is 25% more dense with fewer added volatiles. The heat generated will spread more slowly through the fire, but last longer. RO generates the exact same amount of ash as Kingsford, but won't snuff as quickly. My own head to head test had RO lasting 47% longer than than KBB.
It was the water that brought down your temp, not the charcoal. I've dry smoked with my
WSM with temps in the high 20s to low 30s and had no problem keeping temps up.
Water temp will not increase above 212F at atmospheric pressure. Water absorbs a LOT of heat energy that could be heating your chamber, that's why it is called a "heat sink." Water expands in volume 1700 times when it flashes to 212F steam. That 212F steam condenses when it touches any thing colder. It all acts in a way to keep your chamber temps down.
If you are trying to run at 300F and put water in your smoker, it's like putting a standard carbureator on a 300 mph dragster. No matter what you do, it won't perform as you want.
The majority of experienced
WSM owners have tossed their
WSM instructions and dry smoke. If you do decide to give dry smoking a try, don't use RO like KBB. Use fewer hot briquettes to add to your cold pile for low n slow cooks. For hot n fast, add the same amount.
Let us know how that 5 lb'er turned out!
Edit: One more thought. When the water evaporates, don't refill the bowl. Watch the chamber temp climb dramatically.