For drilling stainless steel you want a good bimetal bit, like Lawson's silver and demming bits. Most bits are good for all propose use and come with a 118° drill point. For SS metal especially food grade SS metal that is very low in carbon making it very hard you want you drill point at 135° to 140°. Also adding a second angle on the backside helps relieve how much is in contact of the drill point at all times thus cooling the bit and metal work piece. I personally like to go with a 135° point and 12° relief angle. Using a cutting oil is also recommend, I like marvel mystery oil myself. Then when performing actual drilling do not constantly drill till through the work piece pull drill trigger and allow to come to full speed then let completely of trigger and let bit come to rest. Then over and over again while applying cutting oil. Another drill bit to consider is a split point bit with the same angles. I used to fabricate SS food grade processing equipment and learned a lot about cutting machining and drilling SS metals.
Hope this helps.