As a retired gunsmith and machinist I can say I've drilled and tapped quite a few holes. I think the most important thing is to be sure the tap is perfectly lined up with the hole. I always preferred to drill the hole then tap it without moving anything. Obviously you can do it with a drill press or milling machine. I always power tapped if it wasn't a blind hole and not having to go too far. If that was the case just turn it by hand and be sure to use tapping fluid. Based on this I think it may be OK but only if you plan on doing a lot of tapping.