We decided last year to try and stop feeding non deer critters.

We purchased 4 of the banks 300# gravity feeders from sportsmans guide for about $225 each shipped and put them out before season opened on a block of land at 4 established spincast feeder and camera sites.

After 5 months of them being out now I think it would be safe to say that we reduced the amount of "wasted" feed going to non target critters by much more than we thought we would. We have used this year probably 30-40% less total feed than we did in this same spot last year.

With the spincast we were getting a lot of crows, blackbirds, dove, hogs, coon, and turkey getting some if not most of the morning throw. We eliminated most of the birds feeding by going to no morning throw and just one longer in afternoon about a hour before sunset.
When we did that though the daytime pictures/travel by feed sites decreased a good bit.

With monitoring the new gravity feeders with cams its clear that the deer are now getting id say 90% of the feed we put out. ( with +/- 10% drop on ground from deer feeding)
Before with the spincast id be surprised if they were getting 50% of it.

With the gravity feeders daytime and night time usage is about the same so it hasnt turned them nocturnal only with it being there to get whenever. But these feeders are in areas where we arent pressuring them so im sure that helps on their daytime usage.

Deer of all sizes are using them. The 2 largest bucks we know of on the property use them.
We started with straight corn, then went to one bag of protein pellets mixed into 4 bags of corn... the next fill was 2 protein, 3 corn, and now its about half and half.

Im very pleased that we tried these.