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I voted for a 3-1/2" Congress jack. Since the jack pattern would have longer primary blade, I am concerned that a larger knife might cause some legality issues for our British and possibly other members. Anyway, the 3-1/2" is right in the sweet spot size wise for me. I would not kick a 4" Congress jack to the curb though; I have a couple Buck 301/302 single blade stockman knives with 4" handles and about 3-1/4" blades which suit me quite well, so might a 4" Congress jack.
Ed J
I voted for 3.5-4 jack. I think the jack is more visually pleasing. I'd be happy with wharncliff or sheepfoot, heck, both would be radical!
I agree with the above, I voted 3.5 to 4, but would like to see it stay closer to 3.5. As someone mentioned, a 3 5/8ths might be the ticket as many are already tooled up at that pattern size.