For large muscle group usually 3 working but I do two warm ups, small isolation muscle 3 working with one warm up. Currently I am doing the same type of compound lifts 3x a week for full body.
But, I am going to change it to no warm up and progress to almost failure : 3 straight sets 6-8 reps because I am going to do extra exercises for the muscle. I want to barely be able to hit six reps by my third set. I will hit the most powerful exercise for each body part(for myself). Weighted Dips(completely perpendicular/no lean) is the Meat and Potatoes for my Triceps so I will start with that and follow with 3-5 more exercises.
Example :
I may do 5-6 exercises for one muscle. So I will do less sets. One may be a burnout set at the end but, I want to really hit the group with different angles/stance/grip/etc.
I am actually working on the actual mass program with another trainer as we speak. I definitely am ready for more variety as my upper/lower cable system and attachments wil be there when I get home next week.
Max