Chamber Polishing

[6mm Shooter]

What is the best way to polish a chamber? I had a case split on me and it has burnt into the chamber. I was told that I could polish out a few thousands and it would be good as new. Would a few thousands be too much? It is a 300 win mag and all of my fired brass measures .5115 above the belt at widest point above the webbing. Should I use valve grinding compound on a bore mop or do i have to take the barrel of and spin it in a lathe?

 

[ringo]

The same burn that happened in your chamber happens regularly with each round going through the barrel. Have you tried cleaning it up with bore solvent and a patch, or OOOO bronze wool and some Flitz. You don't want to screw up the throat or alter any dimensions radically. You might want to PM "guntech" and get his input.

 

[alberta tactical rifle]

DO NOT use valve grinding compound!! it will leave your chamber far to rough.
If some solvent does not remove it get a piece of 3/8" wooden dowel , make a cut about an inch lengthwise and use some crocus cloth to polish it out. Spin the dowel by hand in 1 direction to keep the crocus cloth attached through the slot in the dowel, if it takes more than just a little elbow grease there are bigger issues here. To remove any metal with crocus cloth would require days of endless turning so no worry about damage. Crocus cloth is available at most auto and machine supply shops, its used for polishing cranks and other things where near zero metal removal is required.

 

[Rich McFarlane]

Try aggressively cleaning the body part of the chamber. If this don't remove the the problem use a split rod with steel wool wrapped around it in a drill and work it into the body area of the chamber.

I can't see a split case causing damage requiring hogging out the chamber a few thou., but if there is damage, you should remove the barrel, set it back one thread and rechamber.

 

[guntech]

What is the best way to polish a chamber? I had a case split on me and it has burnt into the chamber. I was told that I could polish out a few thousands and it would be good as new. Would a few thousands be too much? It is a 300 win mag and all of my fired brass measures .5115 above the belt at widest point above the webbing. Should I use valve grinding compound on a bore mop or do i have to take the barrel of and spin it in a lathe?

You could use 400 grit wet or dry paper as Alberta Tactical Rifle described using crocus cloth. It would take a long time to change a dimension with it and it should remove this "burn" a bit quicker than crocus cloth. If you have an actual groove in the chamber that needs to be removed, that is best left to a gunsmith.

 

[6mm Shooter]

Thanks guys. I will take a look at it today with a bore scope and then try something depending on what I see. I did try jewler rouge on a bore mop last night cleaned most of it up but not the one bad spot.