It looks like the sailors marching in the first photo are squeezed in and not enough room to march abreast correctly, or else there's a personal battle going on between a couple of sailors ,
Here's a photo of some Marines marching with WLN rifles, Ray
Attachment 56479
PS, Jim, were those 40 rds you shot reloads? If so, what powder and loads were you using? I reload for mine, Ray