@guests: the Mosin uses stripper clips. These hold 5 rounds, you clip the thing to the gun and then you push the rounds from the clip into the magazine of the gun. After that, you take the clip away and close the bolt, the clip never enters the magazine. You can put additional rounds into the mag at any time after that, it makes no difference.
It isn't like the en-bloc clip of the M1 Garand, which is pushed into the magazine and ejected when empty.