I have found that with some small sizes of split point drills they can drill oversize holes in some materials, I found this out the hard way after drilling some 2.9mm holes to then ream to a 3mm H7 hole. The reamer didn't remove any material when used as the pre-drilled holes were bigger than the reamer diameter, a 3,1mm Dormer drill blank was a good sliding fit in the drilled hole.
The lesson I learnt here was to always confirm the drilled diameter on some scrap same type material before possibly spoiling the part.
Emgee