I would guess that 6" western or cigar was the norm in Winston form or Fisher. That's a good default. It depends a little on the reel seat length. At least I want the combination to put my thumb where the rod feels just right on the forecast and then relaxes just right onto my index finger as the line settles. I also want a little room to move up and down the grip for other fishing motions or just a change of position for comfort. So I mock up a grip from cork rings and feel my way to the best length and shape. If need be, the length of the reel seat can be reduced by cutting its barrel, making sure there is still enough to loosen the locking ring far enough to allow clearance for the longest foot of reels you would use on the rod. Insert style seats can be mounted at "shorter" dimensions as well, again, leaving adequate clearance. Some rods will feel like they want a longer grip, others shorter. It is quite likely the 7 footer might feel good to many users with a grip as "short as 5" Shorter than that, I think you would have too much flex in the butt ahead of the hand--but that, too, is a personal preference in response to the feel of the blank.
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