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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Is (7) RUM really THAT much of a powder "waster"???
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<blockquote data-quote="J E Custom" data-source="post: 683802" data-attributes="member: 2736"><p>Most of today's magnums are over bored and can be considered powder wasters unless the correct</p><p>bullet weight and barrel length is used.</p><p></p><p>The reason for bigger cases is to propel larger bullets faster than with smaller cartriges.</p><p></p><p>Your velocities are impressive but not as high as can be reached with the big 7mm.</p><p></p><p>With today's new powders this is achievable with the big cases and longer barrels.</p><p></p><p>So unless you have a 26"+ barrel you will find that the shorter barrel cannot burn all of the </p><p>powder with the light bullets (The silver flakes are unburnt powder).</p><p></p><p>Today's bullets have problems with velocities much over 3600 ft/sec depending on there type</p><p>and construction and in my experance I have found that if a cartrige/rifle combination can </p><p>exceed this I increase the bullet weight to slow it down to a reasonable velocity while maintaining</p><p>near max pressure and velocity.</p><p></p><p>For any given cartrige there is an optimum bullet weight that will produce the optimum velocity,</p><p>trajectory and energy.</p><p></p><p>Example: A 7/08 optimum bullet weight would be 120 to 150grains . A 7 Rem Mag would be 140</p><p>to 160 grains and the 7 RUMs optimum bullet weight would be 160 to 190 grain bullets to get the</p><p>most of the case capacity but would need a 28" or more barrel.</p><p></p><p>So "waste" is a by product of Big cases with big bullets and long barrels if velocity is one of the </p><p>main goals for long range hunting and shooting.</p><p></p><p>A larger powder charge needs a longer barrel and a heavier bullet to burn more efficiently and </p><p>reduce some of the throat erosion related to unburnt powder exiting the barrel.</p><p></p><p>Look at some of the loading data and you will see the optimum bullet weight for a given cartrige,</p><p>that has the best combination of energy at the POI best velocity(Not the fastest) and drop.</p><p></p><p>Is the 7 RUM nessary ? probably not. but it will do more with heavy bullets than any other factory </p><p>7mm.</p><p></p><p>Just my opinion.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 683802, member: 2736"] Most of today's magnums are over bored and can be considered powder wasters unless the correct bullet weight and barrel length is used. The reason for bigger cases is to propel larger bullets faster than with smaller cartriges. Your velocities are impressive but not as high as can be reached with the big 7mm. With today's new powders this is achievable with the big cases and longer barrels. So unless you have a 26"+ barrel you will find that the shorter barrel cannot burn all of the powder with the light bullets (The silver flakes are unburnt powder). Today's bullets have problems with velocities much over 3600 ft/sec depending on there type and construction and in my experance I have found that if a cartrige/rifle combination can exceed this I increase the bullet weight to slow it down to a reasonable velocity while maintaining near max pressure and velocity. For any given cartrige there is an optimum bullet weight that will produce the optimum velocity, trajectory and energy. Example: A 7/08 optimum bullet weight would be 120 to 150grains . A 7 Rem Mag would be 140 to 160 grains and the 7 RUMs optimum bullet weight would be 160 to 190 grain bullets to get the most of the case capacity but would need a 28" or more barrel. So "waste" is a by product of Big cases with big bullets and long barrels if velocity is one of the main goals for long range hunting and shooting. A larger powder charge needs a longer barrel and a heavier bullet to burn more efficiently and reduce some of the throat erosion related to unburnt powder exiting the barrel. Look at some of the loading data and you will see the optimum bullet weight for a given cartrige, that has the best combination of energy at the POI best velocity(Not the fastest) and drop. Is the 7 RUM nessary ? probably not. but it will do more with heavy bullets than any other factory 7mm. Just my opinion. J E CUSTOM [/QUOTE]
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Is (7) RUM really THAT much of a powder "waster"???
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