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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Can changing a stock alter your average FPS?
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<blockquote data-quote="Bullet bumper" data-source="post: 674237" data-attributes="member: 17844"><p>A few months loaded will not cause serious neck weld in the true sense but every time you reload the brass work hardens a bit more and the harder the brass the quicker true neck weld will take place . However it will have more neck tension than it had when originaly loaded . How much more depends on how soft the necks were to begin with , how thick the brass is and how much neck tension was initially applied. I have done a lot of work on neck weld and completed a 10 year trial on stored reloads . When the brass age hardens it also shinks in diameter at the thinnest points that are under strain , the neck , and quite dramaticly . </p><p>I don't think that increased neck tension is the whole issue as the velocity difference is quite small and some of it would be normal chrony error and normal shot to shot variations . </p><p>One way to combat incraesed neck tension on stored loads is the seat the bullet long to start with and then when it comes time to use them seat the bullet to the correct depth . This helps break the grip to some degree but does not arrest long term strain hardening and shinkage . </p><p>The military know all this and usually use and replace there ammo in around 7 year cycles . </p><p>For pecision shooting regular annealing of the neck is a good idea as long as it is done right .</p></blockquote><p></p>
[QUOTE="Bullet bumper, post: 674237, member: 17844"] A few months loaded will not cause serious neck weld in the true sense but every time you reload the brass work hardens a bit more and the harder the brass the quicker true neck weld will take place . However it will have more neck tension than it had when originaly loaded . How much more depends on how soft the necks were to begin with , how thick the brass is and how much neck tension was initially applied. I have done a lot of work on neck weld and completed a 10 year trial on stored reloads . When the brass age hardens it also shinks in diameter at the thinnest points that are under strain , the neck , and quite dramaticly . I don't think that increased neck tension is the whole issue as the velocity difference is quite small and some of it would be normal chrony error and normal shot to shot variations . One way to combat incraesed neck tension on stored loads is the seat the bullet long to start with and then when it comes time to use them seat the bullet to the correct depth . This helps break the grip to some degree but does not arrest long term strain hardening and shinkage . The military know all this and usually use and replace there ammo in around 7 year cycles . For pecision shooting regular annealing of the neck is a good idea as long as it is done right . [/QUOTE]
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Can changing a stock alter your average FPS?
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