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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.260 vs 6.5 Creedmore
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<blockquote data-quote="J E Custom" data-source="post: 1945376" data-attributes="member: 2736"><p>When I built my 260 AI, I wanted it to propel a 130 grain bullet over 3000 ft/sec. To assure it could, I made a few changes to the Standard AI version that would allow me to get the desired velocity and still be able to fire form standard 260 Remington cases/ammo in it. </p><p>These were the changes. </p><p></p><p>Increase the free bore from .119 to .200 to allow any Ogive shaped bullet. next I changed the lead angle from 3 degrees to 1,5 degrees. This also allowed any seating depth desired to single load or feed from the magazine.</p><p></p><p>This rifle/cartridge has no problem exceeding 3,000 ft/sec with 130 class bullets staying well within the SAMMI pressure specifications. and is very close to the performance of the PRC, not that I was trying to duplicate the ballistics of the PRC because at the time it had not came out but it is Within 50 ft/sec at present, and once I get the load tweaked it should be very close without pressure. </p><p></p><p>So far the H 4831 and H 414 have been my best powders for the 260 AI.</p><p></p><p>I bought Lapua brass with the proper head stamp and standard size primer pockets so I would have more primer choices and have been very happy with the SD's and accuracy. Groups have averaged less than a 1/4 MOA and is improving. </p><p></p><p>I don't believe that the 260 is any better than the newer cartridges, but for sure it is just as good as they are fed the right ammo even though it is older. The standard 260 and the AI version will match most 6.5's in its class in performance and accuracy, so if you already have one, there is no reason the change unless you just want something new. </p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1945376, member: 2736"] When I built my 260 AI, I wanted it to propel a 130 grain bullet over 3000 ft/sec. To assure it could, I made a few changes to the Standard AI version that would allow me to get the desired velocity and still be able to fire form standard 260 Remington cases/ammo in it. These were the changes. Increase the free bore from .119 to .200 to allow any Ogive shaped bullet. next I changed the lead angle from 3 degrees to 1,5 degrees. This also allowed any seating depth desired to single load or feed from the magazine. This rifle/cartridge has no problem exceeding 3,000 ft/sec with 130 class bullets staying well within the SAMMI pressure specifications. and is very close to the performance of the PRC, not that I was trying to duplicate the ballistics of the PRC because at the time it had not came out but it is Within 50 ft/sec at present, and once I get the load tweaked it should be very close without pressure. So far the H 4831 and H 414 have been my best powders for the 260 AI. I bought Lapua brass with the proper head stamp and standard size primer pockets so I would have more primer choices and have been very happy with the SD's and accuracy. Groups have averaged less than a 1/4 MOA and is improving. I don't believe that the 260 is any better than the newer cartridges, but for sure it is just as good as they are fed the right ammo even though it is older. The standard 260 and the AI version will match most 6.5's in its class in performance and accuracy, so if you already have one, there is no reason the change unless you just want something new. J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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.260 vs 6.5 Creedmore
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