For those of us who are confirmed 28mm fans but who relish Grand Tactical gaming dont discard Bloody Big Battles as being only for the smaller scales.....I have spent sometime following battle reports, reading the rules .....and am convinced the following basing will still keep the ethos without being too cumbersome
Infantry 40mm by 40mm
Cavalry 50mm by 50mm
Artillery 50mm by 50mm
As my pockets are not deep it does allow me to put together 28mm Divisions based on minimal castings.