Why does one have to put their finger under the top bullet of the clip to reload a Mosin-Nagant?

I don`t do that. If you put your finger under the top Cartridge there is no room for 5 because your finger is in the way. What kind of technique is this? Post a picture or link.

I simply insert the bottom of the loaded clip of 5 in the slot and press down with thumb.

Thanks for the video links but this last sentence answered your question.

>You may mean when loading the CLIP by pulling up with the bullet end of #1 cartridge to make sure you are not locking behind the rim of #2 cartridge, however, you do let go before placing in receiver.<

To give the Russians "The Finger".

To assure reliable feed.

It’s the easiest way to do it