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Rifles, Reloading, Optics, Equipment
Reloading
Velocity Effect of Bullet Tension
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<blockquote data-quote="muzzletalk" data-source="post: 2017327" data-attributes="member: 113581"><p>I'm generally one to read vs. post but this post caught my eye. I think "neck tension" is overlooked. I'll be the first to admit, I'm an expert in absolutely nothing. But I can tell you what I have found in all my testing. So take this as just one mans view on the subject. </p><p></p><p>It is impossible to be certain of all other variables. If you change one thing, you've changed everything. I've spent a considerable amount of time, effort, and money trying to reduce or remove the variables that I can control. When I'm testing theory, problem, or function all prep is completed without deviation. Primer pocket depths are checked, primer seat depths are checked, brass sorted, bullets sorted, etc.. the list goes on. Primers are seated with Primal Rights CPS, Auto Trickler for powder, and more to the point of this discussion, a hydro bullet seat press to validate seat pressure. The hydro bullet seat press was my biggest asset when I tested "neck tension". It is about as close as I can get to measure the tension placed on a bullet when seated since we can't directly measure tension. </p><p></p><p> I have found more variance in accuracy and little in precision based on "neck tension". Meaning my point of impact may change, however, how close each shot was to one another wasn't profound. Of course, you will most likely see some variance but I believe that is dependent on other factors like tolerances in manufacturing the bullet, etc... </p><p></p><p>when I load for competition or hunting, I prep with an expansion mandrel. a hydro seating press takes way to much time. I use an expansion mandrel that is the same size as the bullet for my bolt guns with minimal recoil. For my 6mm rifles, I use a .243 mandrel, 6.5 Creed I use a .264. You can certainly feel the pressure variations in seating bullets when you use a mandrel that's the same caliber as the bullet. You'll also be surprised just how much tension spring back applies to a seated bullet. </p><p></p><p>Just to note, I'll use more neck tension when I shoot the 300 PRC or larger magnum calibers for obvious reasons.</p><p></p><p>Hope this helps.</p></blockquote><p></p>
[QUOTE="muzzletalk, post: 2017327, member: 113581"] I'm generally one to read vs. post but this post caught my eye. I think "neck tension" is overlooked. I'll be the first to admit, I'm an expert in absolutely nothing. But I can tell you what I have found in all my testing. So take this as just one mans view on the subject. It is impossible to be certain of all other variables. If you change one thing, you've changed everything. I've spent a considerable amount of time, effort, and money trying to reduce or remove the variables that I can control. When I'm testing theory, problem, or function all prep is completed without deviation. Primer pocket depths are checked, primer seat depths are checked, brass sorted, bullets sorted, etc.. the list goes on. Primers are seated with Primal Rights CPS, Auto Trickler for powder, and more to the point of this discussion, a hydro bullet seat press to validate seat pressure. The hydro bullet seat press was my biggest asset when I tested "neck tension". It is about as close as I can get to measure the tension placed on a bullet when seated since we can't directly measure tension. I have found more variance in accuracy and little in precision based on "neck tension". Meaning my point of impact may change, however, how close each shot was to one another wasn't profound. Of course, you will most likely see some variance but I believe that is dependent on other factors like tolerances in manufacturing the bullet, etc... when I load for competition or hunting, I prep with an expansion mandrel. a hydro seating press takes way to much time. I use an expansion mandrel that is the same size as the bullet for my bolt guns with minimal recoil. For my 6mm rifles, I use a .243 mandrel, 6.5 Creed I use a .264. You can certainly feel the pressure variations in seating bullets when you use a mandrel that's the same caliber as the bullet. You'll also be surprised just how much tension spring back applies to a seated bullet. Just to note, I'll use more neck tension when I shoot the 300 PRC or larger magnum calibers for obvious reasons. Hope this helps. [/QUOTE]
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Velocity Effect of Bullet Tension
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