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Fine tuning loads lee factory crimp die
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<blockquote data-quote="Petey308" data-source="post: 1641414" data-attributes="member: 106845"><p>Here's another excerpt from my notes where I've discussed this before with someone:</p><p></p><p>I can tell you why you're getting better consistency. You're getting more consistent neck tension. The collet on the FCD is applying a consistent amount of neck tension on the mouth of the case. </p><p></p><p>Nathan Foster has a section in his reloading book talking about it. </p><p></p><p>I've experienced the same thing, and after reading his book, it all makes sense now. </p><p></p><p>Consistent velocity is derived from consistent neck tension and consistent pressure, as well as proper bullet to bore concentricity/alignment. </p><p></p><p>I myself have gone the route of annealing and using a mandrel. I have also experimented in the past with the proper size bushing die, but to achieve true uniform neck tension throughout the length of the neck with a bushing due, you really need to turn the necks to ensure the thickness is even and you're not applying more tension on one spot on the bullet that is more than another. I get great velocity consistency annealing and using a mandrel to see final tension, and I don't have to worry about crimping. </p><p></p><p>Crimping can actually reduce velocities. More energy is used to release the bullet and thus velocity is reduced. That's a big reason why I don't like to do it. I've never had an issue with bullets moving from recoil. </p><p></p><p>If you don't anneal, using a FCD is a great way to essentially cheat at getting consistent neck tension. It's essentially a crutch. </p><p></p><p>Too much crimp can give negative results though. That's why if you're doing a crimp, it's best to experiment and find the best amount of crimp that works best. It's also imperative that all your cases are trimmed consistently to the same length as different lengths will result in different amounts of crimp.</p></blockquote><p></p>
[QUOTE="Petey308, post: 1641414, member: 106845"] Here’s another excerpt from my notes where I’ve discussed this before with someone: I can tell you why you’re getting better consistency. You’re getting more consistent neck tension. The collet on the FCD is applying a consistent amount of neck tension on the mouth of the case. Nathan Foster has a section in his reloading book talking about it. I’ve experienced the same thing, and after reading his book, it all makes sense now. Consistent velocity is derived from consistent neck tension and consistent pressure, as well as proper bullet to bore concentricity/alignment. I myself have gone the route of annealing and using a mandrel. I have also experimented in the past with the proper size bushing die, but to achieve true uniform neck tension throughout the length of the neck with a bushing due, you really need to turn the necks to ensure the thickness is even and you’re not applying more tension on one spot on the bullet that is more than another. I get great velocity consistency annealing and using a mandrel to see final tension, and I don’t have to worry about crimping. Crimping can actually reduce velocities. More energy is used to release the bullet and thus velocity is reduced. That’s a big reason why I don’t like to do it. I’ve never had an issue with bullets moving from recoil. If you don’t anneal, using a FCD is a great way to essentially cheat at getting consistent neck tension. It’s essentially a crutch. Too much crimp can give negative results though. That’s why if you’re doing a crimp, it’s best to experiment and find the best amount of crimp that works best. It’s also imperative that all your cases are trimmed consistently to the same length as different lengths will result in different amounts of crimp. [/QUOTE]
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