Not sure if it's just my propensity to look at powders out of the normal "Go To" powders but I have not tried H4350 yet in my 6mm Creedmmor even though I have some. When I got my Horizon built 6mm Creedmoor I loaded N160 and Alliant 4000 MR and the N160 worked so well I decided to use that until I run out.
I just started using Reloder 17 in my new AR 10 in 6.5 Creedmoor and it seems like it's going to be a good choice.
"Anyone taking up handloading necessarily plays with unknown factors and takes chances. But so does anyone who drives a car,goes to a cocktail party,eats in a restaurant,or gets married."
Jack O'Connor 1963