>>2857626Float and weight rating are different things.
Weight rating is the design threshold before mechanical failure probability skyrockets. Float is directly related to the type of snow you're hiking through.
MSR have additional extenders you can add to their shoes that will increase the "float" but will not increase the "weight rating."
I live in the west so the snow is heavy and wet. I never use the floats. I can also, easily, go over the shoe's wight ratings but still be able to "stay on top of" the snow.