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Rifles, Reloading, Optics, Equipment
Reloading
338 lapua oal reloading
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<blockquote data-quote="SidecarFlip" data-source="post: 875990" data-attributes="member: 39764"><p>If it's a bushing die. the bushing fits inside the die body and is removable and you need to size your neck to your pill and order the appropriate sized bushings. Bushing dies are considerably more expensive than a fixed cavity die, like 2 times as much so, if you paid less than a hundred bucks for the die set (new) it will be fixed cavity.</p><p> </p><p>If it is a bushing die and you haven't calculated the diameter of the pill versus the neck diameter of the case, you probably have the incorrect bushing installed.... but I don 't think you have a bushing die, I think it's fixed cavity.</p><p> </p><p>The reason I ask about the expander ball has to do with it's relative position in the die itself. You want the ball to expand the inside of the neck BEFORE the neck reaches the upper cavity and the outside gets sized. one reason I always remove the decapping pins from all my dies and use a dedicated decapper die plus a dedicated decap die has a much stronger decap assembly so you rarely break pins. I use a Lyman BTW.</p><p> </p><p>If, the expander ball is HIGH in the die cavity, it elongates the neck an excessive amount because it's working the neck brass against the inner diameter of the upper cavity. Consequently, your cases grow excessively, you trim the cases to over all length and the necks get progressively thinner, eventually craking. The metal goes somewhere. In this case you are trimming it off and the neck gets thinner and thinner.</p><p> </p><p>As a rule (and I can get disputed on that on this forum), I myself don't ever use a neck sizer die. It stays in the box if it came as a set. I tend to buy dies one at a time and so I don't buy neck dies if I don't have to. Reason being, a neck die only resizes the neck and shoulder datum area. You want to resize the body as well (which goes against the grain on fireforming brass) but again thats how I do it.</p><p> </p><p>The Lapua case is an abnormality in itself because of the length and diameter versus generated pressure upon ignition. To that end, you are right against the benchmark for annealing and annealing properly is a whole other subject.</p><p> </p><p>Even with a fixed cavity die, it's possible to alter the neck tension by reducing the diameter of the expander ball with fine crocus cloth or even fine steel wool (depending on how much you want to reduce it and increase neck tension, however, after the first firing and subsequent resize, the neck is starting to workharden and won't be as ductile as it was when the case was virgin brass. </p><p> </p><p>With any die, bushing or fixed cavity, you can 'bump' the shoulders back. You can get a dedicated bump die but all dies for bottleneck cases will bump shoulders back. oftentimes too much. The more you bump the shoulder back, the farther the case neck end, intrudes into the throat and that intrusion can cause hard ejection or no ejection at all in the case of a tight chamber.</p><p> </p><p>Lots of things going on.</p></blockquote><p></p>
[QUOTE="SidecarFlip, post: 875990, member: 39764"] If it's a bushing die. the bushing fits inside the die body and is removable and you need to size your neck to your pill and order the appropriate sized bushings. Bushing dies are considerably more expensive than a fixed cavity die, like 2 times as much so, if you paid less than a hundred bucks for the die set (new) it will be fixed cavity. If it is a bushing die and you haven't calculated the diameter of the pill versus the neck diameter of the case, you probably have the incorrect bushing installed.... but I don 't think you have a bushing die, I think it's fixed cavity. The reason I ask about the expander ball has to do with it's relative position in the die itself. You want the ball to expand the inside of the neck BEFORE the neck reaches the upper cavity and the outside gets sized. one reason I always remove the decapping pins from all my dies and use a dedicated decapper die plus a dedicated decap die has a much stronger decap assembly so you rarely break pins. I use a Lyman BTW. If, the expander ball is HIGH in the die cavity, it elongates the neck an excessive amount because it's working the neck brass against the inner diameter of the upper cavity. Consequently, your cases grow excessively, you trim the cases to over all length and the necks get progressively thinner, eventually craking. The metal goes somewhere. In this case you are trimming it off and the neck gets thinner and thinner. As a rule (and I can get disputed on that on this forum), I myself don't ever use a neck sizer die. It stays in the box if it came as a set. I tend to buy dies one at a time and so I don't buy neck dies if I don't have to. Reason being, a neck die only resizes the neck and shoulder datum area. You want to resize the body as well (which goes against the grain on fireforming brass) but again thats how I do it. The Lapua case is an abnormality in itself because of the length and diameter versus generated pressure upon ignition. To that end, you are right against the benchmark for annealing and annealing properly is a whole other subject. Even with a fixed cavity die, it's possible to alter the neck tension by reducing the diameter of the expander ball with fine crocus cloth or even fine steel wool (depending on how much you want to reduce it and increase neck tension, however, after the first firing and subsequent resize, the neck is starting to workharden and won't be as ductile as it was when the case was virgin brass. With any die, bushing or fixed cavity, you can 'bump' the shoulders back. You can get a dedicated bump die but all dies for bottleneck cases will bump shoulders back. oftentimes too much. The more you bump the shoulder back, the farther the case neck end, intrudes into the throat and that intrusion can cause hard ejection or no ejection at all in the case of a tight chamber. Lots of things going on. [/QUOTE]
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