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Rifles, Reloading, Optics, Equipment
Reloading
6.5-06 load info
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<blockquote data-quote="Dano1" data-source="post: 731147" data-attributes="member: 14209"><p>I know that they are similar cartridges, but you just can't use data from one bore diamater to a smaller one even though the case capacity of the cartridges are almost identical. This is because they have diffrent bore diameters and because of expansion ratios to bore diamater, you'll end up with higher pressures in a smaller bore than a larger bore using the same case. This is why diffrent powders need to be used for diffrent cartridges using the same case. A good yet extreme example is the .458 Win mag Vs the .264 Win mag Same case but due to powder expansion you need a faster powder like 4895 for a .458 vs a slow powder for the .264 like Retumbo.</p><p> </p><p>I know that they (a 6.5-06 and a .270 Win) are close and some powders can be used interchangeably from similar bore diameters, but it is actually safer to work up a bullet using data from the same cartridge and a bullet similar in weight. Pressures are also diffrent depending on the length of the bearing surface of the bullet and this also is another reason for using a powder with a slower burn rate for a smaller diameter cartridge. </p><p> </p><p>I guess what I'm really getting at is that trying to make a cartridge act like another and get the same results as the one you want to copy is virtually impossible. Each one has to be addressed diffrently. There are ways to do it, but I certainly don't reccommend it.</p><p> </p><p>Also, even though (lets say) you have two bullets one for a .264 cal and one for a .270 cal with identical BCs and you load them to the same muzzle velocity, they won't fly the same way at long range. The heavier one will retain it's velocity longer than the lighter one resulting in a diffrent trajectory over all. </p><p> </p><p>Hope this is helpful.</p><p> </p><p>Dan</p></blockquote><p></p>
[QUOTE="Dano1, post: 731147, member: 14209"] I know that they are similar cartridges, but you just can't use data from one bore diamater to a smaller one even though the case capacity of the cartridges are almost identical. This is because they have diffrent bore diameters and because of expansion ratios to bore diamater, you'll end up with higher pressures in a smaller bore than a larger bore using the same case. This is why diffrent powders need to be used for diffrent cartridges using the same case. A good yet extreme example is the .458 Win mag Vs the .264 Win mag Same case but due to powder expansion you need a faster powder like 4895 for a .458 vs a slow powder for the .264 like Retumbo. I know that they (a 6.5-06 and a .270 Win) are close and some powders can be used interchangeably from similar bore diameters, but it is actually safer to work up a bullet using data from the same cartridge and a bullet similar in weight. Pressures are also diffrent depending on the length of the bearing surface of the bullet and this also is another reason for using a powder with a slower burn rate for a smaller diameter cartridge. I guess what I'm really getting at is that trying to make a cartridge act like another and get the same results as the one you want to copy is virtually impossible. Each one has to be addressed diffrently. There are ways to do it, but I certainly don't reccommend it. Also, even though (lets say) you have two bullets one for a .264 cal and one for a .270 cal with identical BCs and you load them to the same muzzle velocity, they won't fly the same way at long range. The heavier one will retain it's velocity longer than the lighter one resulting in a diffrent trajectory over all. Hope this is helpful. Dan [/QUOTE]
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Reloading
6.5-06 load info
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