To my surprise, data from the new Speer manual caught my attention and initiated an exercise in trialing some of the newer powders. I found 2 loads that produced good accuracy in my Whelens. 8208 under 250 gr RN Hornadys looks good and makes a kind of retro looking round. My new "go to" load is a 250 gr Partition over a case full of Power Pro 2000 MR.
While my Whelens have never been finicky, that last package is producing a little better accuracy than I've experienced with RL15 or Varget.