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Rifles, Reloading, Optics, Equipment
Reloading
284 Win bushing.
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<blockquote data-quote="SBruce" data-source="post: 723187" data-attributes="member: 21068"><p>You should certainly have enough tension with the 309.</p><p> </p><p>There is however a downside to too much tension. Or too much working of the brass perhaps is the better wording. With a no-turn saami max. chamber, your brass will expand .004 or .005 upon firing and then necked down possibly . 008 or .010 with the 309, and then "necked up" by the bullet seating into it again by another .004 or .005. This doesn't really hurt anything, except it will eventually work harden your case necks prematurely, causing the need to anneal or replace cases for best precision and accuracy. Lapua cases arent cheap, I wouldn't want to replace them prematurely.</p><p> </p><p>Too much tension often also leads to excessive and unnecessary runout on loaded rounds, which can then induce less accuracy...........Goods and Bads in all decisions unfortunately.</p></blockquote><p></p>
[QUOTE="SBruce, post: 723187, member: 21068"] You should certainly have enough tension with the 309. There is however a downside to too much tension. Or too much working of the brass perhaps is the better wording. With a no-turn saami max. chamber, your brass will expand .004 or .005 upon firing and then necked down possibly . 008 or .010 with the 309, and then "necked up" by the bullet seating into it again by another .004 or .005. This doesn't really hurt anything, except it will eventually work harden your case necks prematurely, causing the need to anneal or replace cases for best precision and accuracy. Lapua cases arent cheap, I wouldn't want to replace them prematurely. Too much tension often also leads to excessive and unnecessary runout on loaded rounds, which can then induce less accuracy...........Goods and Bads in all decisions unfortunately. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
284 Win bushing.
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