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Fine tuning loads lee factory crimp die
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<blockquote data-quote="Petey308" data-source="post: 1641452" data-attributes="member: 106845"><p>So, just to add a summary to my posts, I do not put any sort of crimp on any of my rifle loads. I've done plenty of testing and experimenting of my own to come to my conclusion. I actually used to use those crimp dies and believed they were awesome. It's not hard to do your own tests and come to your own conclusions. </p><p></p><p>In my experience, neck tension is key for accuracy and low SD/ES. Yes, you can achieve it by using a FCD, but it's an inferior method. Why go an inferior route when accuracy is detrimental? This is long range hunting, so with that in mind, the clean kill of an animal is front and foremost. Stacking the odds in your favor for that should be priority. Like I said, a FCD leaves the round open for compromise. Why would you want the highest and greatest amount of tension on the bullet only around the rim of the case neck? </p><p></p><p>If you truly want the best, starting with an annealed neck that has been sized with a mandrel is the best way. Now you have even and adequate tension throughout the entire length of the neck contacting the bullet, not just at the mouth of the case. Increase your tension to .003" and you'll see a decrease in your SD/ES. Do that by decreasing the diameter of your mandrel. </p><p></p><p>The big plus to a mandrel is that if there are inconsistencies with the thickness of the brass at the neck, it will push those inconsistencies to the outside diameter, leaving a flush and uniform surface on the inside diameter to contact the bullet. A bushing die will push those inconsistencies to the inside diameter and create uneven contact with the bullet. That is, unless you turn the necks to achieve consistent thickness. </p><p></p><p>Using a FL sizing die with an expander ball will create tendencies where the expander ball stretches the neck and shoulder of the case as it exits the case. A mandrel does not do this. </p><p></p><p>I can elaborate on this process if you'd like, but I'll keep it brief and simple for now.</p></blockquote><p></p>
[QUOTE="Petey308, post: 1641452, member: 106845"] So, just to add a summary to my posts, I do not put any sort of crimp on any of my rifle loads. I’ve done plenty of testing and experimenting of my own to come to my conclusion. I actually used to use those crimp dies and believed they were awesome. It’s not hard to do your own tests and come to your own conclusions. In my experience, neck tension is key for accuracy and low SD/ES. Yes, you can achieve it by using a FCD, but it’s an inferior method. Why go an inferior route when accuracy is detrimental? This is long range hunting, so with that in mind, the clean kill of an animal is front and foremost. Stacking the odds in your favor for that should be priority. Like I said, a FCD leaves the round open for compromise. Why would you want the highest and greatest amount of tension on the bullet only around the rim of the case neck? If you truly want the best, starting with an annealed neck that has been sized with a mandrel is the best way. Now you have even and adequate tension throughout the entire length of the neck contacting the bullet, not just at the mouth of the case. Increase your tension to .003” and you’ll see a decrease in your SD/ES. Do that by decreasing the diameter of your mandrel. The big plus to a mandrel is that if there are inconsistencies with the thickness of the brass at the neck, it will push those inconsistencies to the outside diameter, leaving a flush and uniform surface on the inside diameter to contact the bullet. A bushing die will push those inconsistencies to the inside diameter and create uneven contact with the bullet. That is, unless you turn the necks to achieve consistent thickness. Using a FL sizing die with an expander ball will create tendencies where the expander ball stretches the neck and shoulder of the case as it exits the case. A mandrel does not do this. I can elaborate on this process if you’d like, but I’ll keep it brief and simple for now. [/QUOTE]
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