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Rifles, Reloading, Optics, Equipment
Gunsmithing
Polishing a new chamber
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<blockquote data-quote="Rprecision" data-source="post: 1763079" data-attributes="member: 86219"><p>The last 3 rifle's I chambered, both with SS and CM barrels, were left raw as the finish reamer left them. I have yet to encounter a problem with this method. </p><p></p><p>I have been reading some on the topic of polishing chambers. There seems to be 2 schools of thought about the topic. To be clear this is not discussing trying to eliminate dimensional problems such as pitting, scoring, etc. This is how a new chamber is finished, primarily for a bolt action rifle.</p><p></p><p>1. Leave it alone. This maintains the tightest dimensions. Break the sharp corners at the entrance, but no internal polishing is done to the chamber wall.</p><p></p><p>2. Polish it to varying levels ranging from very light to mirror polish. Those of a benchrest persuasion tend to favor a high polish. Others a light polish to break the smooth surface left from reaming.</p><p></p><p>The main discussion surrounding this topic is the relationship between the brass case and the chamber, specifically how well they grip each other during firing. It is proposed a medium or course polish leaves a rough surface for the brass to grip. This in turn reduces bolt thrust which is safer and improved action longevity. Alternatively, its argued a mirror polish has more grip, is more attractive, improves brass life and so on. There is clearly a broad range here</p><p></p><p>I have never polished one. I am considering these philosophies but dont have any experience polishing. Im inclined to try a medium scotch bright IF I decide to try anything.</p><p></p><p>My application is hunting guns, match and target guns.</p><p></p><p>What do you do and why? What can you share, suggest, etc.</p><p></p><p>Thanks</p></blockquote><p></p>
[QUOTE="Rprecision, post: 1763079, member: 86219"] The last 3 rifle's I chambered, both with SS and CM barrels, were left raw as the finish reamer left them. I have yet to encounter a problem with this method. I have been reading some on the topic of polishing chambers. There seems to be 2 schools of thought about the topic. To be clear this is not discussing trying to eliminate dimensional problems such as pitting, scoring, etc. This is how a new chamber is finished, primarily for a bolt action rifle. 1. Leave it alone. This maintains the tightest dimensions. Break the sharp corners at the entrance, but no internal polishing is done to the chamber wall. 2. Polish it to varying levels ranging from very light to mirror polish. Those of a benchrest persuasion tend to favor a high polish. Others a light polish to break the smooth surface left from reaming. The main discussion surrounding this topic is the relationship between the brass case and the chamber, specifically how well they grip each other during firing. It is proposed a medium or course polish leaves a rough surface for the brass to grip. This in turn reduces bolt thrust which is safer and improved action longevity. Alternatively, its argued a mirror polish has more grip, is more attractive, improves brass life and so on. There is clearly a broad range here I have never polished one. I am considering these philosophies but dont have any experience polishing. Im inclined to try a medium scotch bright IF I decide to try anything. My application is hunting guns, match and target guns. What do you do and why? What can you share, suggest, etc. Thanks [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Polishing a new chamber
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