I use H-335 in my 223. I don't have a 308 in a pistol (Encore) but I have reloaded for it in rifles. H-335 will work, but a bit slower powder might be better. SO, Varget is slower, yet it will also work in the 223. If ones gets too slow of a powder, the case capacity of the 223 will hinder its performance. Something in the Varget burn range would probably work for both. H-335 is my CHOICE for the 223. I feel it would work in the 308 also. Maybe you might know someone who could let you try some of their H-335 if they have it. Good-luck...BCB