I shot some 6's today out of 4 different chokes (no Sumtoy choke). My 870 has a 26" barrel, all shots today were at 40 yds.
Primos Jellyhead Maximum.570 ~ 111
JEBS Headhunter .555 ~ 112
Carlson's Turkey .575 ~ 113
Carlson's LongBeard .568 ~ 145
If I could get the pictures to post I would, but all the patterns look nice and even