I agree... the common 12ga 1,325 fps, 2-3/4", 00 buck, nine-pellet shot shells are not only the standard but like other common shells are most likely to be on sale. I see Cabela's has them on sale for about $4/5 rounds right now for WW Super X. You may be able to get a better deal on a case of 250.
My last buy was a case of Federal Premium 00.
My last buy was a case of Federal Premium 00.