Your practical solution is bear-wrestling from a boat. Use it as with any other animal which does not have ranged attacks: sit on a boat in deep water, provoke a bear, punch him until he scratch your openings somewhat, then retreat back to the deep water, restore your defences and return to the combat. It must be performed on vast shallows or with strategically placed boats to block the bear when he will decide to run away, with punching as your main attack you may have not enough time to finish him when he will turn his back.
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As for the fair battle in the open field: NO. Not a single chance to even scrawniest q60 bear.
Assuming your gear is not top-tier, given stats are not nearly enough to fight with a bear in the open field hand-to-hand and without a decent horse. If you plan to go wrestling, it's even worse. Actually, even with a horse but without at least some combat experience (say, riding a horse in dense forest), an encounter with a bear will be extremely dangerous situation which may result in death.
jpublic wrote:what unarmed # I would need to use the spam tactic against the bear?
The problem with a bear is that he will not use a spam tactic against you. The beast accumulate initiative points quickly and then use them for devastating attacks, high-q bear can give you 4 openings ALL AT ONCE to 60%, based roughly on your stats. After that you'll start to receive at least 80 dmg with each hit unless you not elaborate your combat behaviour immediately from punch-spam to something that can restore your defences, starting from effective defensive moves/initiative management, ending with using the terrain advantage, like using cliffs or caves to buy time.
I do not know which UC will be sufficient to punch a bear without relying on more complex combat moves. I don't think 250 is enough. The damn beast was buffed up in one of the recent updates, and that was after the combat system change, when the combat with wild animals became generally harder. And even before that bear was not exactly the weakest dweller of the forest.