3-9 is plenty for that application. Remember, the higher power, the less eye relief you will get, which leads to crawling and then you get scope bit, and a bite from any scope on a .338 is going to sting. Instead of looking for higher power, get good light in the scope and something tough. You have significant recoil on that rig, so get something that won' t get it' s guts busted out by that rifle. I recently bought a Burris (MADE IN THE USA!), and, although I bought it for a 45/70 (1.75-5), the thing has great light and is strong as an ox. Check them out on the web, they make very high quality scopes, and they are reasonably priced for the most part. Ted Nugent uses them!