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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: 3082041" data-attributes="member: 117715"><p>I'm making the points that there isn't a significant difference between the two, and that you seem to be favoring the 25 by comparing hand loaded velocities to factory published velocities for the 6.5CM AND comparing two different bullet designs which in your comparison also favors the 25. Comparing the 135 LRH to the 144 LRH is a much more fair comparison because they are actually from the same product line and both pointed. With the 9gr weight increase the 6.5 CM might actually be 100fps behind the 25 CM, but even so, the difference in results is negligible. I accidentally flipped them at 100fps though, and I messed something at 50fps. At a 100fps disadvantage the 6.5CM looses by 15ft*lbs at 1000yds. At a 50fps disadvantage the 6.5CM wins by 28ft*lbs(not over 100. Oops) at 1000yds. What's my point? They're basically the same! There's not a substantial difference. They're very close to each other.</p><p></p><p>I built a pair of 6.5-257AI's instead of 257AI's. I didn't do so because one was better than the other. I did so because there is wide spread, mainstream availability of excellent bullets. Although .25cal bullet selection has improved greatly, the good bullets of modern design are primarily only available through niche manufacturers. Berger makes what, 3? Two of them are some of the newest and best designed bullets that Berger makes. While I think availability truly favors 6.5mm the gap is narrowing, and that really just makes the difference negligible. Shoot whichever one you want. Having built some 6.5-257AI's, if someone asked "257AI, or 6.5-257AI?" My answer would be "6.5-284". The reason would be cheaper dies, better brass availability, factory ammo and rifles if that suits you. Does the same dang thing.</p></blockquote><p></p>
[QUOTE="ImBillT, post: 3082041, member: 117715"] I'm making the points that there isn't a significant difference between the two, and that you seem to be favoring the 25 by comparing hand loaded velocities to factory published velocities for the 6.5CM AND comparing two different bullet designs which in your comparison also favors the 25. Comparing the 135 LRH to the 144 LRH is a much more fair comparison because they are actually from the same product line and both pointed. With the 9gr weight increase the 6.5 CM might actually be 100fps behind the 25 CM, but even so, the difference in results is negligible. I accidentally flipped them at 100fps though, and I messed something at 50fps. At a 100fps disadvantage the 6.5CM looses by 15ft*lbs at 1000yds. At a 50fps disadvantage the 6.5CM wins by 28ft*lbs(not over 100. Oops) at 1000yds. What's my point? They're basically the same! There's not a substantial difference. They're very close to each other. I built a pair of 6.5-257AI's instead of 257AI's. I didn’t do so because one was better than the other. I did so because there is wide spread, mainstream availability of excellent bullets. Although .25cal bullet selection has improved greatly, the good bullets of modern design are primarily only available through niche manufacturers. Berger makes what, 3? Two of them are some of the newest and best designed bullets that Berger makes. While I think availability truly favors 6.5mm the gap is narrowing, and that really just makes the difference negligible. Shoot whichever one you want. Having built some 6.5-257AI's, if someone asked "257AI, or 6.5-257AI?" My answer would be "6.5-284". The reason would be cheaper dies, better brass availability, factory ammo and rifles if that suits you. Does the same dang thing. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6.5mm - 25cal = .007"
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