Just got in an eBay magazine, the May 1981 issue of
Guns & Ammo with an article by Howard E. French on 'Shooting the 8mm Nambu'...I thought I'd add it to my Nambu cartridge thread, since I was anticipating a comparison of bullets/powder/loads, but it has only one bullet, one powder, and one load...
But it does have a couple interesting points about the magazine and that makes it a worthwhile read...