This is another myth with shotgun shells.
Shot shells typically have brass or steel bases. The height of the base is a marketing tool, nothing more. Typically, factory shells with a taller base have a higher powder charge and are therefore, faster shells. However, it's the chamber that contains the pressure, not the base of the shell. So, high or low brass can have exactly the same charge.
In fact, there are some shells out there with no brass or steel. They are 100% plastic and they work just fine.
What really matters is the DREQ or FPS of the shell. The faster the load, the more powerful it will be with that particular shot amount.
I think most who shoot shotguns know the difference between the different loads. In shotgun country Hi Brass means a heavy load for hunting purposes. Although if one starts will technical stuff about chamber pressure and velocity nobody will know what you are talking about and care less.