Joe;
My understanding of a "Square load" was one in which the length of the shot column in the bore was equal to the bore dia. I have also on occasion seen it stated to be the equivelent weight to a round ball fittin the bore. One "Writer" bragging upon the 28 ga put it this way. He stated the British put great store in a gun which fired a SQ load (to my knowledge neither Greener or Burrard mentioned it) & proceded to give the rd ball definition. He then stated (correctly) this wt could be found by dividing 16 by the gauge size. Thus he stated (again correctly) 16/28 = .57oz. Then he totally shot himself in both feet by stating this conclusivly proved the 3/4oz load in the 28 was a perfect Sq Load. I don't recall at which grade of elementary school I began studying decimal fractions, but I knew long before I had much knowledge of shotguns that .57 & .75 were not equal, even though they contained the same two digits. I am still not certain if it torqued me the most that someone so ignorant was writing an article, "OR" if it was he thought all his readers were that ignorant. By my definition of Sq the 28 load would be just over 7/16oz incidently & of course the .57oz roundball equivelent is just over 9/16oz.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra