To avoid the bit running around on the domed end of the screw, use a center drill first, as they are made for this type of job, and won't flex at all. Then, once you have a small start in the screw, you can go after it with a standard high speed bit. Just make sure it is NEW, and this is its first cut. Take short cuts, with a drop of oil, and blow out the hole frequently. Go slow, no need to hurry the job.
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