Well, if your deer are likely to field dress no more than 120 pounds; if you are a good shot and can watch the distance and pick "the" best place to hit the deer: I use the Sierra 85-grain HPBT bullet.
I think it's my Sierra book which shows the max amount of 4064 as 37.5 grains. (As always, start below this and work up.) I started with this load in 1970, and have never seen any need to change. 3/8" groups are good enough.
FWIW, Art
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