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As a note, brush axes aren't true billhooks.
Got a pcture of one?
42 Blades is that brush axe what George Silver was talking about when he said forest bill or is that something else entirely?
I have a British billhook with a single bevel grind. I haven't experimented much with it, but my understanding is that the single bevel allows for cutting at lower striking angles (tilted closer to the branch) without glancing off.