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Shotgun - O1 is a great steel - I use a lot of it. But the only advantage it has over CPM 3V is ease of sharpening/polishing and perhaps the cost of the steel. CPM 3V is tougher (impact strength), has better edge-holding/wear-resistance, and is somewhat rust-resistance (7% chromium). It is a "super steel" and has no true competitor. Other steels may do better in a specific task, but no other is as good "all-around". And it is easier to sharpen than D2 or S30V.
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Dan