Accurizing the Mosin-Nagant Rifle
The Mosin-Nagant is an accurate rifle, properly set up. You don't have to settle for mediocre accuracy, and neither do you need to make permanent changes. This is my how-to, and are the techniques I personally use. It is not unusual to see 1.5MOA accuracy from the Mosin-Nagant when using these techniques.
The first thing that should be done is to
smooth the barrel channel using an appropriate sized dowel rod or socket
from a ratchet wrench, wrapped in 320 or so sandpaper. When done, a
straight edge should lay flat along the barrel channel.
Lightly oil the cork bedding on both sides.
Next, cut cork, lay it in, and lay the barreled action into the stock. Observe whether the barrel lays flat. It may. Now, tighten the front and rear action screws to about 50in-lbs. The barrel muzzle will probably raise quite a bit.
Bring lots of ammo and tools to the range. This takes a lot to get right.
Start placing cork material in the front and rear. The barrel should lay as flat as possible when the action screws are tightened.
The barrel will probably not lay perfectly flat in the majority of cases.
I used business card stock on the top handguard. Oil it well.
This is not necessarily a bad thing though. It provides an opportunity to add another known pressure point.
Move the front sling mounting point back!
And this is critical: the barrel bed and handguard have, in effect, been made one with the barrel. It is a heavy barrel now, for lack of a better term. It's bad for harmonics when anything is attached to the barrel, so move the sling back, especially if you are like me and use the sling to shoot!
If your Mosin needs a bit of help, I sell accurizing kits, located here. The hard work is done for you!
The above video is mine. The picture is not. I believe it to be an English translation of an older Russian or Finnish manual, as it illustrates the methods used by both the Russians in their snipers' rifles and the Finns in their general issue rifles, though the Finns made wider use of shims on the barrel. The felt wrapping seems to be uniquely Russian.