After reading reams of info on the net about improving the 91/30, I decided to try my hand at it, but with a twist. I tried the improvements systematically to see what worked and what didn't, rather that doing them all at once and hoping for the best. I took an 'off the rack' 1942 Izzy and decided to hot rod it using traditional techniques. In regards to shimming the barrel, what I found worked the best (at least for me and this rifle) was what was recommended in period Soviet manuals - full floating the barrel and creating a single pressure point between the stock and the hand guard. It took some experimentation to find the sweet spot, but when I did, it made a noticeable improvement.
What I did was;
- Float the barrel from the receiver to the tip of the stock using various grits of sandpaper wrapped around a socket and a dremel where necessary.
- Checked the clearance on both the stock and hand guard (a little tricky) with a piece of paper, final check with a piece of carbon paper over top of the paper (stock side down, to check for uniform wood removal).
- Sealed sanded parts with a coat of Tru Oil* (edit - forgot to add this the first time)
- Cut a piece of 3/4 by 12" twill tape (available from a fabric store), soaked it in oil and wrapped it tightly around the barrel for about 6" where the front spring clip is and re-assembled the rifle.
- Take some shots and let the barrel warm up. If the groupings are lousy, re-adjust the wrap and try again until you find the spot where the wrap
works best.
As an aside, after I did this, I picked up a beautiful '39 Tula from a local CDN Tire and was surprised to find this same modification ( as well as others outlined in the Soviet manual) done to the barrel.
Hope this helps!
Brookwood