No difference between #8 and #7.5 up here on grouse and WC during "bird season" (October). Talking .410 through 12. #7.5 is easier to find in 3" .410s.

#6 with some constriction makes sense for late season grouse, especially dogless. Probably makes sense as a second bbl load - for all I'd know. Early season #6 tears them up too much.

OTOH, saw a noticeable difference between #8 and #7.5 on preserve phez.