There isn't really such a thing as an M.Sc. in physics in the USA. Nearly all schools will admit you to a Ph.D. program directly from your bachelors degree. Some schools will admit you just for a masters, but that usually means you would have to pay tuition. But if you are in the Ph.D. program, you don't have to pay tuition. So if your goal is to do a Ph.D. then just apply to Ph.D. programs.
There might be some bottom tier schools that don't *require* the PGRE, but I would strongly recommend you take it if at all possible so you can apply to schools that are more worth going to. I would be very hesitant to attend a physics program that didn't require the PGRE for admission (in the USA).