I've been using WSF 4.5 to 4.7 gr under a 180gr HP that I cast from a MP-Mold. I went with WSF as it measures out soooooo much better than Unique.

I also cast from a Lee mold a SWC and my 40c eats them with no problems.

If you don't already have one, buy either a Redding G-Rx or a Lee Bulge Buster and extra FCD die for it. You will want to run any and all range pick up brass through them to set them back from 2nd Gen Glock barrel abuse and Skip's BHP.