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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Rifle Cleaning
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<blockquote data-quote="kiwikid" data-source="post: 1687791" data-attributes="member: 56094"><p>Norma conducted a test using what they called "one of the newer 7mm Super Magnums". They didn't let the barrel get hot shooting only a few rounds then allowing the barrel to cool to room temperature. After 30 odd rounds the chamber pressure began to climb from the initial 63000 psi. With 100 rounds down the tube pressures had built to 74000 psi. By 250 rounds the pressure had exceeded Proof Testing pressure of 84000 psi. Soon after 300 rounds had been fired the pressure was so great it broke the transducer. They found the barrel was 0.003" smaller in diameter than when they started.</p></blockquote><p></p>
[QUOTE="kiwikid, post: 1687791, member: 56094"] Norma conducted a test using what they called "one of the newer 7mm Super Magnums". They didn't let the barrel get hot shooting only a few rounds then allowing the barrel to cool to room temperature. After 30 odd rounds the chamber pressure began to climb from the initial 63000 psi. With 100 rounds down the tube pressures had built to 74000 psi. By 250 rounds the pressure had exceeded Proof Testing pressure of 84000 psi. Soon after 300 rounds had been fired the pressure was so great it broke the transducer. They found the barrel was 0.003" smaller in diameter than when they started. [/QUOTE]
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