IMHO in a wild deer situation, I don't think you will do a lot of good putting out sack feed. If you had several square miles with a LOT of feed stations you might do a little good. You need a pen area with feed available 365 days of the year.
You need to remember that a lot of the natural food available for deer is just as high, or higher, in nutrition as the sack feed. You would contribute more in a wild herd to fertilize the natural food sources, like briars, honeysuckle, begalice, American beautyberry, etc, and it would be cheaper to do so.