Unless you measure center to center you are adding the size of your bullet to your groups . If you believe you should measure center to center or extreme spread and subtract bullet diameter , then that is not commonly known as extreme spread or at least it unknown enough people get shit for having groups smaller then their bullet diameter . <| sep |> Not at the moment . <| sep |> Some states have a server wage , which may be as low as $ 2 . 50 hour it may be higher now , I ' m not sure . After higher taxes on tips , many servers don ' t even collect a paycheck and live solely off tip money , sometimes owning the government money from their paycheck . If you don ' t tip , they might literally be paying to serve you . So when you are in the US , tip 15 % for standard service , 20 % if you are happy , and at least 25 % for extraordinary service unless you are in a high class establishment . Only screw them on no tip if it ' s the worst service you ' ve ever had . On average I made 22 % on my tips for 3 years serving food . Don ' t be the asshole who doesn ' t appreciate someone who is working harder for more money .