I will not put protien in a spin feeder because if it falls on the ground it usually ends up wasted and good protien is expensive, I also don't put corn in protien feeders because it can get wet in the bottom and sour or even grow roots over time and ruin a good gravity feeder. What I prefer to do is put one of each feeders together the corn attracts them and they tend to gravitate towards and eat the protien. This works good during the off season when it doesn't matter what time they come in to eat especially in the spring and summer when sntlers are forming, so I feed protien from March to mid to late September and then when the protien feeders go empty I don't refill them and just feed corn until they lose their antlers again. All in all the main key is don't be a city boy wanna be hunter who only feeds when they hunt a real hunter/conservationist feeds year round, I don't just bait my deer I feed and do my part for the whole herd.