I wish I could find one that looks better, is higher resolution. Maybe somebody has a copy we can get scanned at high res?
Or a link to a better quality scan?
And if so, it should be a sticky on this forum.
Here is a copy of the USMC's manual for the M1014 (the M4), in it you will find a verbal description of carrier loading:
http://www.shellgunning.com/wp-content/uploads/2012/02/marine_tm_10698a-101-30_november_2000_benelli_m1014.pdf