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Rifles, Reloading, Optics, Equipment
Reloading
headstamp?
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<blockquote data-quote="Philip J Theodhor" data-source="post: 1759746" data-attributes="member: 111223"><p>Just for comparison both the .300 WM & the .338 WM share an identical shoulder angle of 25 degrees, however from this point on the cartridges are not compatible without reworking your brass via step up dies and trimming to length although the head diameter and web thickness and the belted case diameters are the same.</p><p> Here in lie the issues.</p><p>.300 WM angle .339" -. 490" diameter X .464" in length</p><p>.338 WM angle .369" - .491" diameter X .331" in length</p><p></p><p>.300 WM C.O.A.L = 2.620"</p><p>.338 WM C.O.A.L = 2.500"</p><p></p><p>.300 WM Neck Diameter of brass (O.D.) = .339"</p><p>.338 WM Neck Diameter of brass (O.D.) = .369"</p><p></p><p></p><p> Now even after you get to the correct reworked brass numbers from .300 WM to .338 WM you still must anneal your brass, open up your neck ID,then form your necks OD.</p><p>and you still wont know if it will chamber correctly. Remember tolerance stacking issues will come in to play here as well.</p><p>IMHO this is just another exercise in futility !</p></blockquote><p></p>
[QUOTE="Philip J Theodhor, post: 1759746, member: 111223"] Just for comparison both the .300 WM & the .338 WM share an identical shoulder angle of 25 degrees, however from this point on the cartridges are not compatible without reworking your brass via step up dies and trimming to length although the head diameter and web thickness and the belted case diameters are the same. Here in lie the issues. .300 WM angle .339" -. 490" diameter X .464" in length .338 WM angle .369" - .491" diameter X .331" in length .300 WM C.O.A.L = 2.620" .338 WM C.O.A.L = 2.500" .300 WM Neck Diameter of brass (O.D.) = .339" .338 WM Neck Diameter of brass (O.D.) = .369" Now even after you get to the correct reworked brass numbers from .300 WM to .338 WM you still must anneal your brass, open up your neck ID,then form your necks OD. and you still wont know if it will chamber correctly. Remember tolerance stacking issues will come in to play here as well. IMHO this is just another exercise in futility ! [/QUOTE]
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