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OP never confirmed that Alloy meant aluminum, but if thats the case a 3 flute with a ZRN coating is definitely the way to go. Good chip evac and the coating will give extra life to the carbide by...

Try a 5 flute tool. Even number flutes can sometimes produce that vibration because their snd shape is basically square. Going up to a 5 flute makes a rounder end picture and will always have a tooth...