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Precision Reloading For Long Range Hunting by Jerry Teo
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<blockquote data-quote="Mysticplayer" data-source="post: 169001" data-attributes="member: 8947"><p><strong>good stuff</strong></p><p></p><p>James, thanks for the complements on the article. </p><p> </p><p>I do use FL sizing dies for a few cartridges and been lucky, no runout. Where I find FL sizing to be necessary is in big boomer magnums.</p><p> </p><p>Even though my smaller cartridges are run at similar pressures, they don't expand as much as cases like the RUM. The 223 can take all manner of abuse before needing to be shoulder bumped but the RUM needs FL sizing everytime. The RUM rifle has no headspace issues.</p><p> </p><p>My guess is that the amount/duration of pressure is more severe in the larger case leading to more 'permanent' change in the case. The smaller case has the same/similar peak pressure but less of it so the brass can take more shots before growing.</p><p> </p><p>Just a SWAG theory.</p><p> </p><p>At any rate, function in the field is paramount so size the cases to ensure 100% function.</p><p> </p><p>Jerry</p></blockquote><p></p>
[QUOTE="Mysticplayer, post: 169001, member: 8947"] [b]good stuff[/b] James, thanks for the complements on the article. I do use FL sizing dies for a few cartridges and been lucky, no runout. Where I find FL sizing to be necessary is in big boomer magnums. Even though my smaller cartridges are run at similar pressures, they don't expand as much as cases like the RUM. The 223 can take all manner of abuse before needing to be shoulder bumped but the RUM needs FL sizing everytime. The RUM rifle has no headspace issues. My guess is that the amount/duration of pressure is more severe in the larger case leading to more 'permanent' change in the case. The smaller case has the same/similar peak pressure but less of it so the brass can take more shots before growing. Just a SWAG theory. At any rate, function in the field is paramount so size the cases to ensure 100% function. Jerry [/QUOTE]
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