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Rifles, Reloading, Optics, Equipment
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Belted Magnum AI
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<blockquote data-quote="Deleted member 46119" data-source="post: 1167336"><p>What Edd said.</p><p></p><p>A 30-Nosler would do what you want and a little more at lower pressures.</p><p></p><p></p><p></p><p>As far as I know there is no 30 cal improved version of the 264/7mmRM/338 length belted case.</p><p></p><p>There is a 240 Incinerator which has a wider shoulder and 35° angle. </p><p></p><p>Applying the dimensions of the 240 Incinerator to the 30-338 WM yields a 3 grain increase in capacity. There is only ~4.3 grains difference between a 30-338 and a 300WM.</p><p></p><p>Applying full Ackley style 40° shoulder gets another .2 capacity so very close.</p><p></p><p>At that point you have the same capacity depending on brass brand/lot and a longer neck than the 300WM (~.290 vs ~.263) which can be a good thing.</p><p></p><p>so</p><p></p><p>IIWM: go 30 Nosler and load conservative or I can send you the dimensions and you can have a reamer made, dies made, fire form brass and all that.</p><p></p><p>If you go 30 Nosler, I know a guy with the reamer..... Me.</p><p></p><p>With all that, unless you set the barrel back a little, you won't know how far off the lands you will be until the rechambering is done. Mag length and optimal length may not work out.</p><p></p><p>All the best.</p></blockquote><p></p>
[QUOTE="Deleted member 46119, post: 1167336"] What Edd said. A 30-Nosler would do what you want and a little more at lower pressures. As far as I know there is no 30 cal improved version of the 264/7mmRM/338 length belted case. There is a 240 Incinerator which has a wider shoulder and 35° angle. Applying the dimensions of the 240 Incinerator to the 30-338 WM yields a 3 grain increase in capacity. There is only ~4.3 grains difference between a 30-338 and a 300WM. Applying full Ackley style 40° shoulder gets another .2 capacity so very close. At that point you have the same capacity depending on brass brand/lot and a longer neck than the 300WM (~.290 vs ~.263) which can be a good thing. so IIWM: go 30 Nosler and load conservative or I can send you the dimensions and you can have a reamer made, dies made, fire form brass and all that. If you go 30 Nosler, I know a guy with the reamer..... Me. With all that, unless you set the barrel back a little, you won't know how far off the lands you will be until the rechambering is done. Mag length and optimal length may not work out. All the best. [/QUOTE]
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