If it was my rifle and I did not plan to reload for it, I would go to the store with the best selection of ammunition I could find and buy a box of every brand they sold with 100 grain bullets. Then you go to the range and shoot them all until you find which one shoots best in your rifle. I'd shoot the rest of the ammo for practice.
Go back to the store and get a good supply of that brand and bullet with (hopefully) matching lot numbers, and then go deer hunting.
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