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Rifles, Reloading, Optics, Equipment
Reloading
300 wm dies
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<blockquote data-quote="Mike Matteson" data-source="post: 2490374" data-attributes="member: 101791"><p>If the dies are just a straight FL sizing die. There no adjustment in setting the neck for tension. If you are cutting your neck down to make sure you have even thickness on all sides of the neck. There no adjustment. You can use a mandrel to change the I.D. of the neck. At the same time you are reducing the amount of tension, because there less material or thickness in the neck area. Which isn't a bad thing, but you can't change anything with a standard sizing die. So the bushing die allow you to make adjustment on neck tension partly or a mandrel. You can with a bushing die. The bushing generally come in 0.001 increase or decrease in I.D. sizes. So even if you don't cut your necks for thickness, you can adjust the I.D. of the neck with a different bushing. It allows you to increase or decrease, with the bushing. I see that RCBS has come out with a bushing die. They may have been for sometime, and hadn't seen it. </p><p>To get into a little deeper. If the necks isn't cut for even thickness. The neck will expand somewhat crooked will push the bullet at a small angle. It's not a great amount, but it's there. To me is doesn't make much difference where the uneven is inside or outside the neck area. Some people use a mandrel to push the uneven part of the neck to the outside of the neck. Some don't cut there necks, and other do. I feel you get better accuracies by cutting the necks. </p><p>Now let do the math. .308 is the Dia. of the bullet. Let say the neck thickness is a total of .030Th. for a total of .338 O.D. Now you want .002 to .003 in neck tension. So you are going to reduce the neck by that much. So really you would need a bushing to reduce the neck by that much. Generally there is spring back also. Depending the case and neck you would have reduce the neck O.D by a couple of ths. more. So you want to outside of the neck at .336" or so, but you may have to go to .334 or .335 to achieve the tension you want or need because of the spring back. </p><p>If you already have standard die set that ok too. You can use a mandrel to set the neck tension. Most or should I say some of us don't use the expander ball on the decapping rod either. It tends to stretch the brass. Hopefully the helps in explaining it. I am sure that other people can put pen to paper a lot better than me.</p></blockquote><p></p>
[QUOTE="Mike Matteson, post: 2490374, member: 101791"] If the dies are just a straight FL sizing die. There no adjustment in setting the neck for tension. If you are cutting your neck down to make sure you have even thickness on all sides of the neck. There no adjustment. You can use a mandrel to change the I.D. of the neck. At the same time you are reducing the amount of tension, because there less material or thickness in the neck area. Which isn't a bad thing, but you can't change anything with a standard sizing die. So the bushing die allow you to make adjustment on neck tension partly or a mandrel. You can with a bushing die. The bushing generally come in 0.001 increase or decrease in I.D. sizes. So even if you don't cut your necks for thickness, you can adjust the I.D. of the neck with a different bushing. It allows you to increase or decrease, with the bushing. I see that RCBS has come out with a bushing die. They may have been for sometime, and hadn't seen it. To get into a little deeper. If the necks isn't cut for even thickness. The neck will expand somewhat crooked will push the bullet at a small angle. It's not a great amount, but it's there. To me is doesn't make much difference where the uneven is inside or outside the neck area. Some people use a mandrel to push the uneven part of the neck to the outside of the neck. Some don't cut there necks, and other do. I feel you get better accuracies by cutting the necks. Now let do the math. .308 is the Dia. of the bullet. Let say the neck thickness is a total of .030Th. for a total of .338 O.D. Now you want .002 to .003 in neck tension. So you are going to reduce the neck by that much. So really you would need a bushing to reduce the neck by that much. Generally there is spring back also. Depending the case and neck you would have reduce the neck O.D by a couple of ths. more. So you want to outside of the neck at .336" or so, but you may have to go to .334 or .335 to achieve the tension you want or need because of the spring back. If you already have standard die set that ok too. You can use a mandrel to set the neck tension. Most or should I say some of us don't use the expander ball on the decapping rod either. It tends to stretch the brass. Hopefully the helps in explaining it. I am sure that other people can put pen to paper a lot better than me. [/QUOTE]
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