To be honest it does'nt matter what you use to drill the hole with pistol,pillar or hand brace if you hav'nt got the work in a vice it will move where ever it wants, if it moves the hole will come out triangluar. A drill run at a slower speed rather than flat out will let the bit cut instead of burn and a good sharp properly dressed drill bit will also help. Every body knows how to make holes in timber but steel is a different matter it's much harder,funny that.
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