He can almost double the capacity with a 55 gal drum. That is what I use and I only have 15+ acres to hunt now. I have very light deer density, in fact my neighbor who also has 15 acres has a 55 feeder, yes, the deer make the rounds, but I still only get about 1-2 months of run time. On 40 acres I'd have a 55 gal just to avoid constant re-filling, if you throw a lot and have the deer to clean it up.
As far as the product, sorry I have never tried that one.
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