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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel Wear
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<blockquote data-quote="johnnyk" data-source="post: 481655" data-attributes="member: 307"><p>I have thought about it a few times through the years, as I'm sure others have. Common sense (if it was "common" everyone would have it, right?) tells me more powder creates more heat, but more powder is usually associated with bigger cartridges and thus, probably bigger bores. I think large quantities of powder being burnt down small bores create the most damage to a barrel.</p><p>Example: if you shoot a 7mmRM with 51.0gn of IMR4320 (175gn Partition) and a .243Win with 52.5gn of H414 (55gn Ballistic Tip) seems the .243 would bite the dust first. There's not a lot of difference in the burn rate of these two powders and the Maximum Average Pressure (PSI) recommended by the Sporting Arms and Ammunition Manufacturers' Institute (SAAMI) is 61,000 for the 7Mag and 60,000 for the .243Win.</p><p>My first 7Mag Sendero's barrel went south with a little over 1200rds down the tube. I shot a few 120's and 140's but the majority of bullets were the 150gn with 67gn's of RL22.</p><p>Another factor I think hurts your barrel is excessive and sustained heat like one may encounter in a "target rich environment" (i.e. prairie dog town). Obviously not everyone has to worry with this so it may or may not be a concern.</p><p>Keep it cool and clean and it will probably last a while. JohnnyK.</p></blockquote><p></p>
[QUOTE="johnnyk, post: 481655, member: 307"] I have thought about it a few times through the years, as I'm sure others have. Common sense (if it was "common" everyone would have it, right?) tells me more powder creates more heat, but more powder is usually associated with bigger cartridges and thus, probably bigger bores. I think large quantities of powder being burnt down small bores create the most damage to a barrel. Example: if you shoot a 7mmRM with 51.0gn of IMR4320 (175gn Partition) and a .243Win with 52.5gn of H414 (55gn Ballistic Tip) seems the .243 would bite the dust first. There's not a lot of difference in the burn rate of these two powders and the Maximum Average Pressure (PSI) recommended by the Sporting Arms and Ammunition Manufacturers' Institute (SAAMI) is 61,000 for the 7Mag and 60,000 for the .243Win. My first 7Mag Sendero's barrel went south with a little over 1200rds down the tube. I shot a few 120's and 140's but the majority of bullets were the 150gn with 67gn's of RL22. Another factor I think hurts your barrel is excessive and sustained heat like one may encounter in a "target rich environment" (i.e. prairie dog town). Obviously not everyone has to worry with this so it may or may not be a concern. Keep it cool and clean and it will probably last a while. JohnnyK. [/QUOTE]
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