PhillipM
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People on internet being wrong?
Notable points are, pilot drill 1.5* the chisel edge length, and opening out existing holes should be done with a 3 or 4 flute bit, not a standard jobber drill.
The last one is one people miss often - if you keep opening holes up with steps with normal 2 flute drill bits you end up with a triangular hole by the end of it if you're not very, very careful. Even a single flute bit is better for enlarging existing holes.
I'm with kurtis on that one if you have the machine for it, drill the web size out and get the end size bit straight in.