The Pedersen Device was also modified to fit the US Rifle, Model of 1917 (the American Enfield), and the US Rifle, Model of 1916 (The Remington Mosin Nagant).
Hoppy590 said:the rimmed X54 round makes magazines dificult. even the single stack fixed magazine is prone to rim lock
But the most reliable method is to use the wing shape in the clips to make sure they go into the mag in the proper stack. Also pushing straight down with the thumb won't even work with Finnish stripper clips.