I have a deer feeder idea that works and is better than a pvc feeder. Buy a homepot 5 gallon bucket with a top. Buy a toilet bowl plunger and drill a hole in the bucket. Put the plastic end in the top and have the stick end sticking out. Turn the bucket upside down and hang it on a tree. The deer will hit the stick and feed will come out. Works like a charm and costs 10 bucks to make with a dollar store plunger. The pvc feeders work but the squireels and coon clean it out. I have three built last year.
Once you know you have a bear around, there is pretty well no use using any kind of feeder for deer. The bear will just hang around day after day as long as there is easy food to eat.
Saw these in use down in Arkansas...just straight 6 or 8 " abs pipe wired to a tree..No angle pipe..just straight to the ground. Deer and turkeys paw and scratch at the bottom and it self feeds. I think the grain or corn would run to fast if you didnt butt it to the ground. also, the ones I saw just had a rock on top. The bonus is down there..they have "deer corn" at the feed stores..its kernel corn that has been washed in molases...the critters love it