If those are the 2 powders you have on hand, I would probably suggest Retumbo. H1000 would do just fine for you too, but Retumbo should get you a little more velocity. Ideally, I would say test them both and see which one works best for your needs, but with powder supplies the way they are these...
A Winchester Model 88 chambered in 308 that was handed down to me from my dad who had it handed down to him from my grandpa. Used it on my first elk and deer hunts when I was 12 and continued to use it for years. I started reloading for it when I was 16 and still load 308 occasionally. The...