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Don,
Was the piece clamped down when you were drilling? Were you using a stub length or jobber length drill? Was the bit new, or resharpened?
If the piece was clamped down, either in a vise or with clamps, and you were using a sharp, decent quality bit, your holes should be round. My guess is that you were holding the workpiece with your left hand and feeding the drill with the right hand. It's very easy for the drill (especially if it isn't sharp, or has been sharpened incorrectly) to start tracking a bit squirrelly and create the triangular shaped hole you are talking about.
Also, make sure you use a center drill, or, at the very least, a punch, to get the drill started. One more thing: it's much harder to get a round hole in sheetmetal than it is to get one in a thicker piece of material.
A bit more info is needed here.
Good Luck,
Jim
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