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Aren't pilot bits used for starting a hole?
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I said piloted drill bits. Different.
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From the little bit of reading I've done on the subject it seems I would be better off with a core bit since those are designed for enlarging an existing hole.
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Core bits are for remving a core from a larger piece. Yes, they enlarge the hole, but not in the way you are thinking.
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Are the barrels heat treated?
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Barrel blanks are normalized and stress relieved after drilling, then rifled. They are not hardened. Normal state is approximately 30 Rc. Once heat treated, hardness would be about 48-53 Rc.