Funny you should post this now Shane.........
Dug a new long drop chez moi last week with the hand held post hole digger using the 200mm auger with sharpened 316 teeth and tips. 600 x 600, 2000 deep.
Whizzed through the first 500mm of loam then into the clay for about 100mm. Bucket of water in the bottom, next day effortlessly down another 600mm with the digger. Clay out, water in, repeat the next day. Like Tote says, water is all that is needed.
I've got pics of the tractor PH digger on the old 165 I had when I first used water in the clay overnight and I couldn't pull the auger out without rocking it......... and bending it.
An engineering mate didn't want to know about straightening it so I devised a way...... which took a couple of hours and saved about $500 for a new one.
When I get time to master pic posting I'll show how it was fixed and now stronger than new.
All the holes for my shed were 600 wide and up to 1500 deep, are you using a 600mm auger?
DL


.... better than 19 divots scratched into the surface like the middle of summer I guess
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). Its only a 3meter upright spacing so the footing would be twice the sized needed 
).

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