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Rifles, Reloading, Optics, Equipment
Reloading
6.5 saum from Rem 7mm saum how to do it?
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<blockquote data-quote="orch" data-source="post: 1259039" data-attributes="member: 35688"><p>This is pretty much exactly what I do except I'm starting with 300 saum brass so I size it down in a couple steps... </p><p></p><p>runout from using the expander button could be from inconsistent neck thickness, it can throw it off by 0.002" or so just because the button is pushing the excess brass to the outside (assuming the button is perfectly centred in the case mouth as it is pushing it back out).... 0.010" sounds more like the sizer button is not pulling through the case mouth true... either the de-capping rod is off kilter or it could be that the brass in the case mouth is uneven enough that it is not pulling through evenly and imparting runout because the button is following the path of least resistance... </p><p></p><p>Get yourself a Sinclair expander mandrel die and ditch the expander on the de-cap rod </p><p>You will be much happier with the job it does...</p><p></p><p>I'd definitely turn the necks, if you're keeping track of case runout you will be chasing your tail until your neck thickness is uniform.... trust me I've chased a lot of tail <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /> ....</p><p></p><p>I'd turn it so you have about 0.002" clearance on a loaded round, so 0.298" minus 0.004" (0.002" on each side) = 0.294"</p><p>0.294-0.264= 0.030" devide by 2 and you get case neck thickness of 0.015" as a target</p><p></p><p>Trim to length depends on your reamer, if it's a GAP 4S spec reamer I'm pretty sure they use the 7mmsaum trim length, but I believe they are either 0.120" and 0.085" free bore so I'm guessing yours is a different spec so you'd have to check your reamer print if you have access to it... I didn't use the GAP spec reamer but mine uses the 7saum case length...</p><p></p><p>As I said I use 300 saum brass so I already start out with the shorter case length anyways... I think I end up around 2.018" by the time I get all my cases prepped...</p><p></p><p>Where did you get your hands on 500 peices of REM saum brass anyways? I thought that stuff was extinct!</p><p></p><p>Orch</p></blockquote><p></p>
[QUOTE="orch, post: 1259039, member: 35688"] This is pretty much exactly what I do except I'm starting with 300 saum brass so I size it down in a couple steps... runout from using the expander button could be from inconsistent neck thickness, it can throw it off by 0.002" or so just because the button is pushing the excess brass to the outside (assuming the button is perfectly centred in the case mouth as it is pushing it back out).... 0.010" sounds more like the sizer button is not pulling through the case mouth true... either the de-capping rod is off kilter or it could be that the brass in the case mouth is uneven enough that it is not pulling through evenly and imparting runout because the button is following the path of least resistance... Get yourself a Sinclair expander mandrel die and ditch the expander on the de-cap rod You will be much happier with the job it does... I'd definitely turn the necks, if you're keeping track of case runout you will be chasing your tail until your neck thickness is uniform.... trust me I've chased a lot of tail :D .... I'd turn it so you have about 0.002" clearance on a loaded round, so 0.298" minus 0.004" (0.002" on each side) = 0.294" 0.294-0.264= 0.030" devide by 2 and you get case neck thickness of 0.015" as a target Trim to length depends on your reamer, if it's a GAP 4S spec reamer I'm pretty sure they use the 7mmsaum trim length, but I believe they are either 0.120" and 0.085" free bore so I'm guessing yours is a different spec so you'd have to check your reamer print if you have access to it... I didn't use the GAP spec reamer but mine uses the 7saum case length... As I said I use 300 saum brass so I already start out with the shorter case length anyways... I think I end up around 2.018" by the time I get all my cases prepped... Where did you get your hands on 500 peices of REM saum brass anyways? I thought that stuff was extinct! Orch [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
6.5 saum from Rem 7mm saum how to do it?
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