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Rifles, Reloading, Optics, Equipment
Reloading
Ugly extreme spread........now what ?
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<blockquote data-quote="WiscGunner" data-source="post: 1674581" data-attributes="member: 97288"><p>I think it is important to understand a dimension (.002) used in place of a force (neck tension) takes a lot of assumptions into account. Would be great to have a pull gage to check actual neck tension. In the mean time it is important to remember the dimensional tension of say .002 undersized ID will have different neck tension for different alloys of brass, different states of annealing, different neck thicknesses, different neck length and lubrication variables. </p><p></p><p>Personally I test this in my PRS loads two ways.</p><p></p><p>1) test for ES/SD difference across different neck diameters</p><p>2) test the best performing neck size first. I test these by loading a magazine and whacking it on the corner of my table(covered in cork) a few times with authority.</p><p></p><p>Then I measure my BTO to make sure the 10 rounds didn't shorten. If not, this size of neck ID is providing sufficient neck tension/bullet retention. If the bullets moved, I go to the next tightest setting. </p><p></p><p>This is done with fully prepped and loaded ammo. Any change later such as neck turning or annealing will loosen this retention. Work hardening the brass through a few firings will increase the neck's bullet retention until the brass is too hard to be sized properly. Annealing every time of course will give you the most consistent bullet retention with regards to the particular lot of brass hardness.</p></blockquote><p></p>
[QUOTE="WiscGunner, post: 1674581, member: 97288"] I think it is important to understand a dimension (.002) used in place of a force (neck tension) takes a lot of assumptions into account. Would be great to have a pull gage to check actual neck tension. In the mean time it is important to remember the dimensional tension of say .002 undersized ID will have different neck tension for different alloys of brass, different states of annealing, different neck thicknesses, different neck length and lubrication variables. Personally I test this in my PRS loads two ways. 1) test for ES/SD difference across different neck diameters 2) test the best performing neck size first. I test these by loading a magazine and whacking it on the corner of my table(covered in cork) a few times with authority. Then I measure my BTO to make sure the 10 rounds didn’t shorten. If not, this size of neck ID is providing sufficient neck tension/bullet retention. If the bullets moved, I go to the next tightest setting. This is done with fully prepped and loaded ammo. Any change later such as neck turning or annealing will loosen this retention. Work hardening the brass through a few firings will increase the neck’s bullet retention until the brass is too hard to be sized properly. Annealing every time of course will give you the most consistent bullet retention with regards to the particular lot of brass hardness. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Ugly extreme spread........now what ?
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