I remember when Mark posted that data last year--that is an impressive (and time-consuming) effort! (Thanks again, Mark).
I too enjoy HS-6. I use it mainly for stiffer .45 Colt loads. I got turned on to it by John Linebaugh's
article on using it for stiff 45 Colt loads.It's also a very accurate powder for 9mm. HS-6 was the overall most accurate 9mm powder from this site's testing:
http://www.natoreloading.com/9mmsummary/.