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Well, that's basically what the Slixshot nipples do with their sidewall vent holes.  I'd rather just buy the new nipples rather than experiment with my machining skills on my factory nipples.  Seems to me Slix Springs has already got that all figured out, and they're not that expensive.  Experimenting with milling your own gas-relief grooves on your factory nipples leads to a high probability of just having to replace them anyway, and meanwhile you've expended time and effort and black powder and balls.