1badmagnum,
Last year, based on Contender's experience and assistance, I bought my first surplus powder, 8lbs. of pulled WC820 and can confirm what Contender indicated above, great stuff. I tested (velocity and accuracy) the WC820 with H110 and W296 and got my most accurate results with the WC820...and as Contender indicated, better velocity with less powder. My Ruger SuperBlackhawk with 265gr. SWC GC matched H110 velocity with 1.0 less powder. As you know, each batch can vary, so be careful where you start your powder amounts.
Dan