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Rifles, Reloading, Optics, Equipment
Reloading
Too early to do load developement?
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<blockquote data-quote="MagnumManiac" data-source="post: 1909064" data-attributes="member: 10755"><p>Brass does not elongate in the neck upon firing...it shortens as the case fills the chamber pulling brass from the neck as the body expands.</p><p>Brass elongates in the neck when you SIZE it excessively.</p><p>Cases after firing may have expanded in the neck by .008", .006" on a SAAMI chamber is more common, then your sizing die, typical FL non bushing die, pushes the neck back .010" and then the expander returns it .002" under bullet diameter or whatever. It is this squeazing down and xpanding back that causes necks to lengthen.</p><p>If you don't believe this, I suggest you measure your cases prior to firing, after firing and again after sizing them.</p><p>Also, another example, belted cases are anywhere from .015"-.025" SHORT in the shoulder area prior to firing. Upon firing the shoulder is blown forward by this amount, the neck shrinks in length. So, if the case flows by .025" where is the brass going?</p><p>Too many myths are still believed, cases do not flow. Cases also spring back after firing, if they flowed it would stay the shape of the chamber and never come out.</p><p>Think about it.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1909064, member: 10755"] Brass does not elongate in the neck upon firing...it shortens as the case fills the chamber pulling brass from the neck as the body expands. Brass elongates in the neck when you SIZE it excessively. Cases after firing may have expanded in the neck by .008”, .006” on a SAAMI chamber is more common, then your sizing die, typical FL non bushing die, pushes the neck back .010” and then the expander returns it .002” under bullet diameter or whatever. It is this squeazing down and xpanding back that causes necks to lengthen. If you don’t believe this, I suggest you measure your cases prior to firing, after firing and again after sizing them. Also, another example, belted cases are anywhere from .015”-.025” SHORT in the shoulder area prior to firing. Upon firing the shoulder is blown forward by this amount, the neck shrinks in length. So, if the case flows by .025” where is the brass going? Too many myths are still believed, cases do not flow. Cases also spring back after firing, if they flowed it would stay the shape of the chamber and never come out. Think about it. Cheers. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Too early to do load developement?
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