My experience in a BP-12 with a Briley .665" tube is 100% in a 40" circle at 40 yards. That being said, the center of pattern density varies by about 16" from shot to shot at the same 40 yards. This is very similar to what I have seen with the flite control wad. If forced to shoot factory loads, this would be about #8 or #9 on my list.
John