Tam posted this up: How to work a Mosin Stripper clip
When I hit the link, brain said..uh yep. We had lot's of jams with Belle's Tokorev until we figgered this one out.
Don't remove the mag from the rifle, top load it from the breach. It was the way it was intended to be loaded.
The concept is the same for the Mosin stripper clips. Observe the pics, and note the angle of the rounds.
Whether in the Mosin stripper clip, or our Tokorev mag, they should be stacked thusly: