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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6.5mm - 25cal = .007"
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<blockquote data-quote="ImBillT" data-source="post: 3081745" data-attributes="member: 117715"><p>Even your original was splitting hairs, but it was comparing two bullets of different design, with advantages in favor of the .25, and what is likely excess velocity advantage to the .25 as well. I wish there was a comparable 135gr 6.5mm to compare to the .25. Then you could plug in the same velocity for each and at least be close. The .25 would have a slight BC advantage over the 6.5 if they were the same weight. To be perfectly accurate the 6.5 would have a slight velocity advantage. Honestly that's the issue. SLIGHT. It's only .007". With same weight bullets, the .25 should manage a SLIGHT BC advantage, and the 6.5 should manage a SLIGHT velocity advantage. With same BC bullets, the 6.5 will recoil SLIGHTLY more and have SLIGHTLY less muzzle velocity, but SLIGHTLY more energy and momentum. There's no magic to .257" bullets or to .264" bullets, and both are so close that it's hard to say that one fits in a certain action or even cartridge better than the other.</p></blockquote><p></p>
[QUOTE="ImBillT, post: 3081745, member: 117715"] Even your original was splitting hairs, but it was comparing two bullets of different design, with advantages in favor of the .25, and what is likely excess velocity advantage to the .25 as well. I wish there was a comparable 135gr 6.5mm to compare to the .25. Then you could plug in the same velocity for each and at least be close. The .25 would have a slight BC advantage over the 6.5 if they were the same weight. To be perfectly accurate the 6.5 would have a slight velocity advantage. Honestly that's the issue. SLIGHT. It's only .007". With same weight bullets, the .25 should manage a SLIGHT BC advantage, and the 6.5 should manage a SLIGHT velocity advantage. With same BC bullets, the 6.5 will recoil SLIGHTLY more and have SLIGHTLY less muzzle velocity, but SLIGHTLY more energy and momentum. There's no magic to .257" bullets or to .264" bullets, and both are so close that it's hard to say that one fits in a certain action or even cartridge better than the other. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6.5mm - 25cal = .007"
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