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Rifles, Reloading, Optics, Equipment
Reloading
30-338 reloading help
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<blockquote data-quote="J E Custom" data-source="post: 1029871" data-attributes="member: 2736"><p>Something else to check. </p><p>Measure the neck diameter on a fired case and compare it against a loaded one. (There should be .003 to .004 thousandths difference) If the difference is less, you will have to turn the necks.</p><p></p><p>The fact that the 30/338 is considered a match round (No commercial ammo has ever been </p><p>loaded for it that I know of) the chambers are normally very tight.</p><p></p><p>Also take a fired case and try to insert one of the bullets you are using into it, If it doesn't slip </p><p>right in, the necks need to be trimmed because the neck chamber is a little short.</p><p></p><p>What leads me to this , is when you backed of the lands up to .180 thousandths and still have pressure.</p><p></p><p>My load of 71 grains of H 4831 and the 190 SMK would exceed 3000 ft/sec with no real signs of pressure.</p><p></p><p>For another source of loading data use the Old 308 Norma mag. the two cases are almost </p><p>identical and could share loading data. (It is not recommended that they be fired in each others</p><p>chamber but the loads will work).</p><p></p><p>Good luck, and let us know what you find.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1029871, member: 2736"] Something else to check. Measure the neck diameter on a fired case and compare it against a loaded one. (There should be .003 to .004 thousandths difference) If the difference is less, you will have to turn the necks. The fact that the 30/338 is considered a match round (No commercial ammo has ever been loaded for it that I know of) the chambers are normally very tight. Also take a fired case and try to insert one of the bullets you are using into it, If it doesn't slip right in, the necks need to be trimmed because the neck chamber is a little short. What leads me to this , is when you backed of the lands up to .180 thousandths and still have pressure. My load of 71 grains of H 4831 and the 190 SMK would exceed 3000 ft/sec with no real signs of pressure. For another source of loading data use the Old 308 Norma mag. the two cases are almost identical and could share loading data. (It is not recommended that they be fired in each others chamber but the loads will work). Good luck, and let us know what you find. J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
30-338 reloading help
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