LOL - Yeah - a 300'+ 'hand pump' would be a bit of a bear. That's what cheater bars are for, eh ?
What I had in mind when mentioning 'mechanical pumps' was more on this order (although, in reality, ALL pumps are 'mechanical' - except for jet stream type pumps) Electric pumps vs. the 'guts' of a 'hand pump' - a 'cylinder'.
http://www.awwasc.com/wind/page/cylinders/shallow_well_442 (hand pump type)
http://www.awwasc.com/wind/page/cylinders/easy_pull

A neat table for 'windmill size' considerations:
http://www.awwasc.com/wind/page/operation/pumping_capacities_table

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