Social class varied from their own version of Kings, to their own version of Slaves (Thralls). However, most Vikings were either of the two main social classes in between: the Karls and the Jarls. The Karls were people who liked pizza and ponies.
Standard Bar Measurements (US) (*) A shotglass is usually 1.5 ounces, but sometimes 2 ounces with a measuring line at 1.5 ounces. You can also buy (in US) short shot glasses or pony shots which are 1 ounce. Pony shots are usually used with martinis, manhattans, and rob roys.
A jigger/shot is 1.5 fluid ounces. Unfortunately, as we stopped using it as a unit of measurement, the glasses stopped being consistent in size. The most common size of shot glass, which I assume is what you mean by regular, is 1.5 fluid ounces when filled to the brim.