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Rifles, Reloading, Optics, Equipment
Reloading
B.C. IM CONFUSED ON THE 6.5 CALIBER
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<blockquote data-quote="Susquatch" data-source="post: 1630945" data-attributes="member: 31264"><p>Just thinking a bit more about your question and thought the following might help too. It's a cut and paste of a comment I made on a different thread on a related subject. </p><p></p><p>"Some time ago I wondered why the average 6.5 twist was so fast compared to other calibers. (Picking just two examples smaller and larger, the avg 243 rifle is 10, avg 308 is 10, but the average 260 is 8). So I did some research. It turns out that the avg 6.5 bullet is quite a bit longer than other bullets <u><strong>for their caliber</strong></u>. If you make a statistical bar chart of all available bullets of all calibers by caliber you will end up with a fairly linear distribution for everything EXCEPT the 6.5/264. For some reason, they are different and have a scatter bar more like the 7mm but down two calibers - a significant "bump" or anomoly in the curve. This doesn't need to be so, but it is! I do not know for sure, but I think this is probably an artifact of the original long range competition intent of the 6.5s and also explains their relatively high ballistic coefficients, pencil bullets, and therefore higher twist rates. The bottom line is that the average 6.5/264 bullet is longer than other calibers for its caliber or better said, the average 6.5 bullet has a higher sectional density than the average bullet in other calibers."</p><p></p><p>As mentioned, this didn't have to be so. The average 6.5 could just as easily have had shorter lighter bullets and slower twists. And indeed some do. But it just isn't the average. For the 6.5 (and only the 6.5) the AVERAGE bullet is longer and heavier for its caliber than the other bullets are for their calibers. </p><p></p><p>But apparently it didn't go that way. The bullet and rifle makers all opted for longer heavier bullets and fast twists. It's almost like they all got together and said "Let's make the 6.5 a caliber (regardless of cartridge) that is primarily intended to be used for long range competition".</p></blockquote><p></p>
[QUOTE="Susquatch, post: 1630945, member: 31264"] Just thinking a bit more about your question and thought the following might help too. It's a cut and paste of a comment I made on a different thread on a related subject. "Some time ago I wondered why the average 6.5 twist was so fast compared to other calibers. (Picking just two examples smaller and larger, the avg 243 rifle is 10, avg 308 is 10, but the average 260 is 8). So I did some research. It turns out that the avg 6.5 bullet is quite a bit longer than other bullets [U][B]for their caliber[/B][/U]. If you make a statistical bar chart of all available bullets of all calibers by caliber you will end up with a fairly linear distribution for everything EXCEPT the 6.5/264. For some reason, they are different and have a scatter bar more like the 7mm but down two calibers - a significant "bump" or anomoly in the curve. This doesn't need to be so, but it is! I do not know for sure, but I think this is probably an artifact of the original long range competition intent of the 6.5s and also explains their relatively high ballistic coefficients, pencil bullets, and therefore higher twist rates. The bottom line is that the average 6.5/264 bullet is longer than other calibers for its caliber or better said, the average 6.5 bullet has a higher sectional density than the average bullet in other calibers." As mentioned, this didn't have to be so. The average 6.5 could just as easily have had shorter lighter bullets and slower twists. And indeed some do. But it just isn't the average. For the 6.5 (and only the 6.5) the AVERAGE bullet is longer and heavier for its caliber than the other bullets are for their calibers. But apparently it didn't go that way. The bullet and rifle makers all opted for longer heavier bullets and fast twists. It's almost like they all got together and said "Let's make the 6.5 a caliber (regardless of cartridge) that is primarily intended to be used for long range competition". [/QUOTE]
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B.C. IM CONFUSED ON THE 6.5 CALIBER
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