Is there a long gun open-carry board (that is a separate website) ? It seems like there is some demand (though perhaps less than for this forum re: handguns). I did a quick search and couldn't find one.
I think the "some demand" about which you speak originated in Texas, where carrying of long guns was legal whereas OCing handguns was not. Since the law has changed, the the long gun OC fad has largely faded.