we do a job with 4500 1/2 thru hole in the same part, and the OSG is the only one that can survive 1 piece...actually i can make 3 part with 1 drill...

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If you have coolant thru on your spindle check out Guhring's Firex series...used 'em on H13 tool steel, 1346 3/16" diameter holes thru a 3" thk block....(went from both sides but still...wow)

As for milling,yes, you want a variable helix cutter, I love the Hanita Varimill for SS, they are very tough and last a long time.