I was able to get out and sight in my franchi affinity today and pattern a few loads, I'm shooting a Carlson 575 choke. At 41 yards it shot 136 in a 9 in circle with fed heavyweight 7s and put 87,86,and 77 in a 9in circle with longbeard #5s.
HW 7s look great but looks like you need to try 6s if you are going to shoot LBs.