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Rifles, Reloading, Optics, Equipment
Reloading
RCBS Precision Mic
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<blockquote data-quote="lever-hed" data-source="post: 368869" data-attributes="member: 11667"><p><span style="font-family: 'Arial'"><span style="font-size: 10px">Tom,</span></span></p><p> </p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">First I would say everthig Kevin said is exactly correct. To try and help clarify more for you, the idea behind neck sizing in the first place is to get a tight fit to your chamber (headspace –wise). As you know the closer your sized cases are to the dimension of the chamber, the better alignment to the center of your bore (as the theory goes), and better accuracy. In contrast, what everyone is saying is that for a hunting cartridge , you don't' want to get too tight (headspace-wise), after repeated neck-sizing of cases. </span></span></p><p> </p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">Having said that , after repeated firings of cases that you are neck-sizing only, eventually the shoulder (or headspace) will begin to extend beyond the walls of the chamber, causing unreliable (stiff bolt etc) feeds or not allow you to chamber a round at all. And, when hunting dangerous game, that is potentially a life threatening situation.</span></span></p><p> </p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">Once you realize your cases are getting stiff to extract from the chamber , its time to bump the shoulder (which can be achieved by proper adjustment of a FL sizing die, or a separage "body die"). When this happens, the RCBS mic is extremely handy in measuring the headspace at this point because you now know the limits of your cases based on your rifle's chamber. On my gun, stiff extraction comes around +.001" headspace (+.001" over SAAMI spec). I use a body die to 'bump the shoulder' back to about -.001 or 2. (the body die only sizes the body, doesn't touch the neck). At this point I may bump the shoulder of the case here on out after every reloading or every other reloading. I will have to use a separate neck sizer to size the neck after body sizing. </span></span></p><p> </p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">One other thing, the case overall lengths will tend to grow as you reload for same cases, but when your headspace is tight, they will grow less, hence, less needs to be trimmed. You will need to trim your cases from time to time so be aware of this.</span></span></p><p> </p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">Hopefully this helped..<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite11" alt=":rolleyes:" title="Roll Eyes :rolleyes:" loading="lazy" data-shortname=":rolleyes:" /></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">Good luck.</span></span></p></blockquote><p></p>
[QUOTE="lever-hed, post: 368869, member: 11667"] [FONT=Arial][SIZE=2]Tom,[/SIZE][/FONT] [FONT=Arial][SIZE=2] [/SIZE][/FONT] [FONT=Arial][SIZE=2]First I would say everthig Kevin said is exactly correct. To try and help clarify more for you, the idea behind neck sizing in the first place is to get a tight fit to your chamber (headspace –wise). As you know the closer your sized cases are to the dimension of the chamber, the better alignment to the center of your bore (as the theory goes), and better accuracy. In contrast, what everyone is saying is that for a hunting cartridge , you don’t’ want to get too tight (headspace-wise), after repeated neck-sizing of cases. [/SIZE][/FONT] [FONT=Arial][SIZE=2] [/SIZE][/FONT] [FONT=Arial][SIZE=2]Having said that , after repeated firings of cases that you are neck-sizing only, eventually the shoulder (or headspace) will begin to extend beyond the walls of the chamber, causing unreliable (stiff bolt etc) feeds or not allow you to chamber a round at all. And, when hunting dangerous game, that is potentially a life threatening situation.[/SIZE][/FONT] [FONT=Arial][SIZE=2] [/SIZE][/FONT] [FONT=Arial][SIZE=2]Once you realize your cases are getting stiff to extract from the chamber , its time to bump the shoulder (which can be achieved by proper adjustment of a FL sizing die, or a separage “body die”). When this happens, the RCBS mic is extremely handy in measuring the headspace at this point because you now know the limits of your cases based on your rifle’s chamber. On my gun, stiff extraction comes around +.001” headspace (+.001” over SAAMI spec). I use a body die to ‘bump the shoulder’ back to about -.001 or 2. (the body die only sizes the body, doesn’t touch the neck). At this point I may bump the shoulder of the case here on out after every reloading or every other reloading. I will have to use a separate neck sizer to size the neck after body sizing. [/SIZE][/FONT] [FONT=Arial][SIZE=2] [/SIZE][/FONT] [FONT=Arial][SIZE=2]One other thing, the case overall lengths will tend to grow as you reload for same cases, but when your headspace is tight, they will grow less, hence, less needs to be trimmed. You will need to trim your cases from time to time so be aware of this.[/SIZE][/FONT] [FONT=Arial][SIZE=2] [/SIZE][/FONT] [FONT=Arial][SIZE=2]Hopefully this helped..:rolleyes:[/SIZE][/FONT] [FONT=Arial][SIZE=2]Good luck.[/SIZE][/FONT] [/QUOTE]
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