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Rifles, Reloading, Optics, Equipment
Reloading
Forming IMP/AI Brass. . .Question.
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<blockquote data-quote="Bill Johnson" data-source="post: 1006690" data-attributes="member: 84129"><p>My apologies. </p><p> </p><p>#1, I screwed the pooch on my math. 55mm length minus 47.13mm base-to-neck length = 7.87mm, so you only have a little over one caliber (6.5mm or .264") in neck length best case.</p><p> </p><p>When looking at neck length, as a rule of thumb, whatever your caliber is, in this case .264", you want that much in neck length minimum to properly hold the bullet securely (given normal neck pressure). This is just a rule of thumb that's best adhered to with any rifle that's feeding from a magazine. I can go less then that on single-shots.</p><p> </p><p>I would still say that you should just shoot them to fire form the case. If my math is right (this time), you will end up under your trim-to length but no worries. Folks have been fire-forming that case to the improved version a long time. I don't lose 0.020 on my 280AI, more like 0.012 or so but that's just my experience.</p><p> </p><p>There's not much else you can do because the 6.5 x 55 has a different size case head then the typical 8mm/7mm Mauser/30-06 Springfield. It's a little larger thus forming a false shoulder on a bigger case (which is done to reduce case stretching when forming wildcat or improved cartridges) is not an option.</p><p> </p><p>Again, my apologies for the confusion I created. Usually my math is spot on.</p></blockquote><p></p>
[QUOTE="Bill Johnson, post: 1006690, member: 84129"] My apologies. #1, I screwed the pooch on my math. 55mm length minus 47.13mm base-to-neck length = 7.87mm, so you only have a little over one caliber (6.5mm or .264") in neck length best case. When looking at neck length, as a rule of thumb, whatever your caliber is, in this case .264", you want that much in neck length minimum to properly hold the bullet securely (given normal neck pressure). This is just a rule of thumb that's best adhered to with any rifle that's feeding from a magazine. I can go less then that on single-shots. I would still say that you should just shoot them to fire form the case. If my math is right (this time), you will end up under your trim-to length but no worries. Folks have been fire-forming that case to the improved version a long time. I don't lose 0.020 on my 280AI, more like 0.012 or so but that's just my experience. There's not much else you can do because the 6.5 x 55 has a different size case head then the typical 8mm/7mm Mauser/30-06 Springfield. It's a little larger thus forming a false shoulder on a bigger case (which is done to reduce case stretching when forming wildcat or improved cartridges) is not an option. Again, my apologies for the confusion I created. Usually my math is spot on. [/QUOTE]
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Forming IMP/AI Brass. . .Question.
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