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Throwing knives are typically in the 45-50 RC range, 55 is too hard maybe for O1. They use 4140, 1055 or 5160 for throwing weapons, medium carbon steels typically. Never made a thrower from O1 though so you may want to experiment some as it is a high carbon steel and will tend to break more easily.
That point looks pretty thin and I would think maybe a differential HT may be helpful, but that takes some practice to get right. Obviously you're going to have to make some experimental blanks. Or just temper it back down to 50 if isn't a cutter and you should be OK Chris.
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