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The Range
Ammo & Reloading
30-06 rims breaking
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<blockquote data-quote="Blitzfike" data-source="post: 2154448" data-attributes="member: 807"><p>Lubing the chamber is NOT a good idea. Part of the equation of containing the pressure of firing is for the case walls to grip the chamber. Lubed chambers or overly lubed cases increase the pressure on the bolt face.</p><p>The rotating bolt on the 742 is one of the weak spots. The bolt doesn't have solid locking lugs, it has a series of thinner lugs that tend to break over the years. Also, high pressure rounds cause the bolt to dig into</p><p>the rails in the receiver. Parts for the 742 are extremely hard to get. The difficulty in cleaning the chamber is the cause of most of the deterioration in it. I have owned several over the years, 30-06, 243, and 308. </p><p>I made a chamber brush for them by pouring lead into a 1/4" drive socket to hold the brush in place. I then used a small ratchet to turn the brush with a flex extension. Short of disassembling the receiver (which is</p><p>a real pain..) this is the easies way I have found to keep the chambers clean on these fine old rifles. (I made a short piece of flat stock to wedge into the operating rod to hold the action open for cleaning.) My experience with these says your main problem is a corroded or rusty chamber, but the higher pressure ammo</p><p>is a really bad thing for this rifle.</p></blockquote><p></p>
[QUOTE="Blitzfike, post: 2154448, member: 807"] Lubing the chamber is NOT a good idea. Part of the equation of containing the pressure of firing is for the case walls to grip the chamber. Lubed chambers or overly lubed cases increase the pressure on the bolt face. The rotating bolt on the 742 is one of the weak spots. The bolt doesn't have solid locking lugs, it has a series of thinner lugs that tend to break over the years. Also, high pressure rounds cause the bolt to dig into the rails in the receiver. Parts for the 742 are extremely hard to get. The difficulty in cleaning the chamber is the cause of most of the deterioration in it. I have owned several over the years, 30-06, 243, and 308. I made a chamber brush for them by pouring lead into a 1/4" drive socket to hold the brush in place. I then used a small ratchet to turn the brush with a flex extension. Short of disassembling the receiver (which is a real pain..) this is the easies way I have found to keep the chambers clean on these fine old rifles. (I made a short piece of flat stock to wedge into the operating rod to hold the action open for cleaning.) My experience with these says your main problem is a corroded or rusty chamber, but the higher pressure ammo is a really bad thing for this rifle. [/QUOTE]
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