Height of brass means absolutely nothing in today's shotgun shells. Back when hulls were paper, the higher bras helped prevent burn through, and like the term Dram Equivalent, it has hung around. Some folks think only high brass shells have the power - not true. The box will tell you the load and the velocity, that is what you need to know to determine of the load is right for you.
Standard target loads run from 7/8 to 1, to 1-1/8oz and from 1145 to 1300 fps.
Any payload heavier and/or faster will typically be a field load (and the recoil will let you know)