Your best advice will come from one of the main reloading handbooks which will list powder and amount in grains by caliber including 308 Marlin. One of the most common ones across bullet weights uses H335 in Lee's "Modern Reloading" but there are quite a bit of data in any reloading handbook which typically have been complied. If your looking for what people think are the best for that caliber who have experience with it on this board IDK, caliber not common even among Marlin owners.
Or since Hornady still makes this caliber you might sweet talk their technical support into recommending one. They have their own reloading handbook BTW.