As my original post stated, Im starting with their 1 oz load, and asking about if a 7/8 oz load would work with all of the same components beside that.

Piss poor in what respect? I want a light old-gun load using as much of what I have on hand as possible, and hopefully use less shot. Low pressure and slower than 1200fps is what I want.

I have some Clays, as well as some 4100 and 0175 wads.