303 series Stainless is much more, drill, tap machine friendly than most other common series Stainless..........drilling 304, use a slower spindle speed than you might usually use, keep pressure on the bit, stainless will work harden, keep it cool, set up an air line to blow air on it . Use a GOOD drill bit and tap......better quality here makes a huge difference.
I work with Stainless all the time and I hate it.
