I have an old mossberg I always shot hevi 13 out of, it's got a jebs .655 in it and it's always been a great gun. I shot federal TSS 3" in it the last 2 years and it's been even better. Even with that tight constriction. However this year I got some apex and the box says nothing tighter than .660. I know it's not a huge difference but is this recommendation a safety thing or is it a suggestion for results? I know a tight choke can blow the pattern out. But I was just wondering. I have more open options if need be im just curious.
I know you think it's over kill. That isn't what I'm asking about...