One interesting thing I saw, the individual Marines did not really carry as much ammo with the m1903 as I would have guessed. On patrol the after action reports state they usually carried 25rds and they never ran out in a firefight.

Guadalcanal wasn't the only instance of that happening - about 7300+ M1s got sent to the Philippines before WWII and equipped most of the infantry units of the U.S. Philippine Division as well as the 26th Cavalry. As the vast amount of ammunition was either packed in bulk or 5-round strippers, it was also necessary for soldiers with those units to retrieve their empty clips, if possible, after firing.

Another "myth" I deal with on a fairly regular basis is the one that states that the U.S. Army fought the Japanese in the Philippines "armed only with bolt-action rifles". Such was not the case (although, of course nearly all of the Philippine National Army carried M1917s and a few M1903s).