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First thing you need to do is make sure all of the rims overlap in the same way. The bottom round's rim should be overlapped by the round above it. (just make sure all of the follow this pattern). This prevents jams in the gun.
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This is totally unnecessary with a properly functioning Mosin-Nagant because it has an interrupter which holds down the lower rounds in the magazine and totally prevents double-feeds if the magazine is loaded properly. (A double-feed occurs when the rim of the top cartridge snags the rim of the next lower cartridge.) The interrupter consists of two sheetmetal pieces screwed into the lower outside receiver wall. It is sometimes called an interrupter/ejector because it doubles as the latter.
A Mosin-Nagant WILL double-feed if the shooter attempts to insert a full 5rd stripper clip and fails to press the cartridges down hard enough to push the second-to-top round past the interrupter. The cartridges may need to be shoved down quite firmly depending on the individual rifle. Don't worry about pushing too hard, this is a Mosin-Nagant, you WON'T break it.
If your Mosin-Nagant won't feed properly unless the cartridge rims are arranged as described in texaswoodworker's post, something is wrong with the interrupter.