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It all depends on the crockpot. Why not cut the butt in half and have two meals? Or, if you need that much meat, do it in the oven - 300F for 1 hour per pound. Use a close fitting casserole or other covered pan, add water, broth or BBQ sauce (or a mixutre thereof, until the liquid is half way up the side of the meat. This is a basic Braise.
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As long as you can get the cover on it, it will be ok. If you still don't want to, you can do a nice pulled pork in teh oven - simlar to this one:
http://www.foodnetwork.com/recipes/da...I just did one recently in the crockpot and the recipe said 6-9 lbs on low for 8-10 hrs.