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Long Range Hunting & Shooting
7mm vs. 7mm ultra mag?
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<blockquote data-quote="J E Custom" data-source="post: 263386" data-attributes="member: 2736"><p>ON the barrel burn out issue.</p><p></p><p>Any over bored cartrige will burn out faster than a standard one.</p><p></p><p>P O Ackley did a lot of testing on this problem and so did the military they both came to the</p><p>same conclusions that any round that exceeded 3000 ft/sec and was over bored (Like most</p><p>Magnums ) would be harder on barrels.</p><p></p><p>Powder erosion is the biggest problem with over bored rounds because a lot of powder gets</p><p>pushed out of the chamber and against the throat that has not burned yet.</p><p></p><p>Ball powder was developed to minimize this problem because it was though that the shape</p><p>was easer on the throat.</p><p></p><p>As far as the throat erosion of the 7mmRUM it will probably last 12 to 1500 rounds with good </p><p>loading and cleaning practices ( A lifetime of hunting ).</p><p></p><p>The heaver bullets will help with barrel life ( Lower velocity and more complete burn of </p><p>powders ) plus better BC for long range .</p><p></p><p>The big 7mmRUM was made for big bullets and will amaze you how accurate it is when set</p><p>up with the right powder and bullet combo.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 263386, member: 2736"] ON the barrel burn out issue. Any over bored cartrige will burn out faster than a standard one. P O Ackley did a lot of testing on this problem and so did the military they both came to the same conclusions that any round that exceeded 3000 ft/sec and was over bored (Like most Magnums ) would be harder on barrels. Powder erosion is the biggest problem with over bored rounds because a lot of powder gets pushed out of the chamber and against the throat that has not burned yet. Ball powder was developed to minimize this problem because it was though that the shape was easer on the throat. As far as the throat erosion of the 7mmRUM it will probably last 12 to 1500 rounds with good loading and cleaning practices ( A lifetime of hunting ). The heaver bullets will help with barrel life ( Lower velocity and more complete burn of powders ) plus better BC for long range . The big 7mmRUM was made for big bullets and will amaze you how accurate it is when set up with the right powder and bullet combo. J E CUSTOM [/QUOTE]
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7mm vs. 7mm ultra mag?
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