As others have stated, cheap target loads will work great to start off with. Anywhere from 7/8 oz loads to 1 1/8 oz loads... I generally shoot with 1 oz loads, as they are easy to find, and soft on the shoulder. #7 1/2's or #8's.
And when patterning my gun to see where it shoots on paper, I generally start off with the cheap target loads... Once I have everything pretty much figured out (as in hold points, and POI, POA, etc.), I fire off a round (or two) of the good stuff, just to make sure it is doing what I think it is.