I wanted a hopper to hold 7-10 days worth of coal untended. so it had to feed down to the last shovel full. I ended up with this square funnel design, it works well, but I had to put some aluminum flashing on the inside to aid the coal to slide.. the angle on the bottom is around 30-35*, and coal likes a 40-45* angle. Other than the need for the aluminum flashing it has been a perfect hopper.
I can with two screws remove the 'coal dam' under the auger tube, and clean out accumulated fines from around the auger, this I like 'cause I don't have to climb inside the hopper to do the cleaning. I can use a hooked probe or a small hoe to clean out the area at the end of the auger.

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Greg L