Similar charge weight to make a similar velocity will have absolutely nothing to do with the burn rate of a powder, burn rate being the factor that determines suitability for specific loads. Red Dot and Nitro 100 could have similar burn rates, but it would be a coincidence unrelated to the weight of powder required to propel a shot charge at a certain speed. I do agree that Alliant is a little short on low pressure 12 gauge light loads.