It is very, very, similar in burn rate to 700X. I played with 700X and 155 Gr plated bullets in .40 looking for a light load. It was not very consistent at all. I did finally find a decent combination, but vary it at all and accuracy went away.
Solo 1000 is very fast for .40. Universal clays is much better suited to 165 Gr bullets in .40, even for light loads.