CJ- I have used a deer feeder with a 50 gallon drum for the last few years. It works reasonably well, but better with smaller feed (aquamax 300-400) because the bigger 500-600 feed size tends to get caught in the spinning apparatus attached to the bottom of the feeder. This is something to think about, but sure beats spending $700 (unless you have the dough). As far as humidity, GA may have more of an effect on your feed than OK weather, although OK does get pretty humid. I never had a problem with the feed getting wet since I always kept a lid on the top of the drum, even after lots of rain.
One thing to think about is placement. OK has gotten 22 inches of rain in 180 days. Since I I put the feeder in 2 years ago, the new, higher water level engulfed the feeder and now it probably isn't functional.
In any event, a deer feeder is a good way to feed fish, especially from an economic standpoint.
CC
