RE: arrow shaft selection
there really isnt much difference bewtween .003 and .006, I dont care how good you think your eye sight is you cannot tell the difference of 3 thousandths of an inch with the naked eye. with a micrometer set at .003 the jaws still appear to be completely closed. printer paper is thicker then 3 thousandths of an inch with a micrometer it measured .004. so if you really think 3 thousandths of an inch will affect your accuracy then think whatever floats your boat.
but honestly I dont think it will really matter.