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Sizing with the .308 is your only option. A 7.62 die does not exist in the US ( maybe in Europe). If you do the math they are one in the same.
If loading for a bolt action the neck sizing die or the full sizing die may be all you need. If loading for a semi auto you may need a small base die. Are the 7.62 cases once fired? If so they are often fired out of a full auto and the brass expands. Drop one into your rifles chamber, does it go all the way in? If it does turn the rifle so that it falls out on its own? If it doesn't go all the way in the cases are expanded. If you close the bolt on a case that has not dropped all the way in you may have trouble getting it out!!!! This is where the small base die is required. A set of caliper type micrometers is a must for reloading. Get a good book on reloading, any of these: Sierra, Hornaday, Speer, there are others. Stick to the load data in any of those until you are confident in how well you reload, then make adjustments to loads that work best in your rifle. Avoid some of the loads you may see in other forums, some of those guys are pushing the limits.
I load for an M1A Scout semi auto and a Ruger Gunsite Scout bolt action. I have reloaded .308 both commercial and military brass and 7.62 military brass. (French, Bulgarian, Australian). I've been reloading for just a few years and still learning.
Remember, it is your rifle, your eyes, your fingers, your life and the life of others around you at the range that will be effected, so use and follow all the safety procedures. Happy shooting.