Not exactly. I was thinking the same thing until today. This is more a note to myself, so that hopefully I will remember it - When you get to 38 Special or above, yup, they are pert near indistinguishable, but in smaller calibers like 32 S&W Long at least in the Hornaday 2003 manual, what would be a normal load for one might be a ways above max for the other. I reckon it is that you are dealing with so many tenths of a grain, and that makes a difference. Example with a 90 lead SWC - 1.9 grains of HP-38 is at max, but 2.5 grains of Win 231 is at max. In other words 2.5 grains of HP-38 would be way, way, way above a maximum load.HP-38 and W231 aren't just similar. They are identical.