I'm relatively new to the forum and my question may have been answered before, but if you will bear with me...I need to roast/smoke all at one time, 4-5 Boston Butts 6-9 lbs. each. I have a homemade 275 gallon drum cooker that I can use with propane or charcoal/wood. What temperature should I maintain and how long should I allow for cooking? I do have an electronic meat thermometer so I can keep a close eye on the meat temp and the roaster temp.