I had a full shoulder in the freezer vac packed from last fall and made up this recipe for it the other day.
Seasoned with seasoning salt, garlic powder on all sides
layered both sides with my homemade apple smoked bacon (about 1 to 1 1/2 pounds)
layered both sides with onions
sealed tightly in foil and baked at 250 for 4 hours, then bumped to 275 because I was worried it wouldn't get done by dinner time.
Let cool 15-20 minutes then shredded the shoulder and bacon/onions. Saved juice for a most excellent gravy.
It turned out so good, I will never bother trying to trim out a shoulder again. Best venison roast I've ever had. Tasted nearly like a smoked pork shoulder, very tender, very moist. One of the keys is the bacon, make sure you get real bacon, not stuff made with water and liquid smoke...