Like mentioned searing is the way to do it,
I personally dont like crock potting deer meat, there is really no fat in it and crock pots work best with fatty meats.
You are basically cooking any liquid out of it in the crock pot (even though its swimming in liquid)
Searing it will lock it in, i sear mine when they are still a bit frozen in a dutch oven (enamel coated one) then add a jar of canned tomatoes from the garden and an onion quartered, add some water to cover the roast and medium heat till it starts to bubble good, let it do that for about a half hour then turn down to a nice simmer for 4-5 hours with a lid, then remove lid and thicken liquid as desired..fall apart tender, serve as you like or shred and make bbq sandwiches etc...
I have done the same thing with a crock pot and it was good, just not as good as the dutch oven..
Oh and use bacon grease to sear it in (you do save your bacon grease in a jar in the fridge correct)
