I treat BH 209 just like any other powder. I already know what load my rifle likes, so i take the rifle to the range, shoot 2 fouling shots, and then shoot 2 groups of 3 shots to check the zero on the scope. When satisfied, i am ready to hunt. At the end of the season, i clean the bore. I have shot up to 35 shots or so without cleaning between shots. Every shot was easy to load and the rifle gouped about 2.5" at 100 yards.
I DO NOT clean between shots, it is not needed with BH 209. Actually, i think that it is counterproductive to do so.
I hunt with the bore fouled, this gives me predictable results.