Seem like nearly everyone on on the Grendel forum is in love with IMR 8208, but I've had my best groups, speed, SD and ES with H335. In my area it is carried by a lot of stores so it works and it's available!
Ive used IMR 8208 during this experiment, this has been the first loads that had the speed I wanted with great SD and ES. It took one whole pound of powder to do it. While most of my H335 loads have single digit SD/ES.
I know that sounds a bit backwards to not use my optimal powder but I have a bunch of the 8208 so I figured to burn some of it up. Glad I did...now I have a use for the powder.