Without the gauge of the metal, the dimensions of the stud and the pounds per foot of snow load in your area there is no way to answer your question properly. Metal framing comes in many gauges, from 25ga to as heavy as 14ga. It is also dimensional such as 1 5/8", 2 1/2", 3 5/8", all the way up to a 10". In STL, metal framing will not carry the snow loads, typically.