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The Range
Rifle & Shotgun Discussion
Considering a 6.5x55 Swede Build
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<blockquote data-quote="Buzzgun" data-source="post: 1234072" data-attributes="member: 4715"><p>Physics tells us that, when bore size, bullet weight, barrel length and pressure are constant, velocity increases at 1/4 the percentage of increase in case capacity. </p><p></p><p>According to Norma, there is a 5% difference in case capacity between the 260 and the 6.5x55. </p><p></p><p>Using the formula above, you can expect a 1.25% increase in velocity when both cartridges run the same bullet at the same pressure, in other words, there is NO WAY you can gain 75 fps at the same pressure.....period! If you think you can, YOU are fooling yourself.</p><p></p><p>Even if the 6.5x55 was 100 fps faster, that hardly qualifies as "spanking" the 260. Run the ballistics yourself, using a 140 grain Sierra Matchking and a starting velocity of 2750 fps, then increase the velocity to 2850 fps, the difference in drop at 500 yards is only 4.5 inches....that's less than one minute of angle difference in trajectory and that is relatively insignificant in long range shooting.</p><p></p><p>If it is increased velocity you are after, the 6.5x284 and the 6.5-06 are both faster than the 260 and the 6.5x55.</p><p></p><p>I never said one was inherently more accurate, I said the 6.5x55 was neither faster nor more accurate than the 260. Lots of folks using the 260 for long range competition, the 6.5x55? not so much, if that tells you anything. Accuracy is more a function of the rifle build and the bullet rather than the cartridge case.</p><p></p><p>By the way, I have owned 3 rifles chambered in 6.5x55, still have 2 of them.</p></blockquote><p></p>
[QUOTE="Buzzgun, post: 1234072, member: 4715"] Physics tells us that, when bore size, bullet weight, barrel length and pressure are constant, velocity increases at 1/4 the percentage of increase in case capacity. According to Norma, there is a 5% difference in case capacity between the 260 and the 6.5x55. Using the formula above, you can expect a 1.25% increase in velocity when both cartridges run the same bullet at the same pressure, in other words, there is NO WAY you can gain 75 fps at the same pressure.....period! If you think you can, YOU are fooling yourself. Even if the 6.5x55 was 100 fps faster, that hardly qualifies as "spanking" the 260. Run the ballistics yourself, using a 140 grain Sierra Matchking and a starting velocity of 2750 fps, then increase the velocity to 2850 fps, the difference in drop at 500 yards is only 4.5 inches....that's less than one minute of angle difference in trajectory and that is relatively insignificant in long range shooting. If it is increased velocity you are after, the 6.5x284 and the 6.5-06 are both faster than the 260 and the 6.5x55. I never said one was inherently more accurate, I said the 6.5x55 was neither faster nor more accurate than the 260. Lots of folks using the 260 for long range competition, the 6.5x55? not so much, if that tells you anything. Accuracy is more a function of the rifle build and the bullet rather than the cartridge case. By the way, I have owned 3 rifles chambered in 6.5x55, still have 2 of them. [/QUOTE]
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Considering a 6.5x55 Swede Build
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