Poor cleaning practice led to a small dent/burr in the chamber mouth of my Win M70 Super Grade. It loads without any resistance but after firing, upon ejection, the bolt is stiff and the burr grabs the shell at the head space. I end up with a big gouge down the shell when I eject.

I was told by the local gun shop that they could polish it out if I left it with them. They broke my Mathews bow so I don't trust them. Any suggestions of a simple solution I can do in my own shop?

Going to be a judgement call on your part as to how much abrasive, but basically thepollishing is done with a rod in a drill, and an abrasive.



You can use a cleaning rod for this, but better results will come from taking a piece of round stock (wood prefered), you can fit in your drill chuck, cut a slot in the end of it, and wrap either cloth impregnated with something like jewellers rouge, or Crocus cloth around the end, and through the slot.

Stroke it back and forth evenly. It's real easy to bell mouth the chamber if you use too tight a wrap, Do not concentrate on one spot, move evenly up and down the chamber, keeping the rod in line with the bore.

I used to do this with hydraulic valve bores. A high degree of polish is possible.

The method I have used a number of times is to put Flitz on a chamber mop, and chuck it in a cordless drill (in case of a bolt action, use the first part of a three part cleaning rod as an extension). Push it into the chamber and spin for about 20 second. Put some more Flitz on, and do-over.

If you want to get a little more aggressive, I have done the same thing with an old bore brush, 0000 steel wool and Flitz.

I am sure the purists among us are cringing, but I never could measure a dimensional difference. I polish all my dies with this method (0000 steel wool and Flitz), and it seems to polish the high spots off, but not measurably enlarge anything. HTH, Dutch.

Boilerroom,

I've been wondering if you could go into a little more detail about this burr, is is a gouge from getting "stabbed" by a cleaning rod end or jag? If so I would be tempted first to glue a piece of 220 grit sandpaper to a 3/16" rod and just try to hit that spot. just use a tiny strip of paper, enough to do a 3/4 or so wrap around the rod, then with the action out of the gun and a good light concentrate on just hitting the burr with it. After it is down then a good spin with flitz on a mop as has been suggested, but it sounds like all you really need to do is get rid of a high spot.

If you know its on the lip of the belt recess and you know its on the bottom, you could probably take a hardened rod like the reverse end of a 3/8ths drill bit and hand-burnish it in a few minute's time. Do it at the range a little at a time until the problem goes away. Shouldn't take more than 2 or 3 rounds.

Thanks guys.