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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Need help troubleshooting 300 RUM pressure issue.
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<blockquote data-quote="Augustus" data-source="post: 901012" data-attributes="member: 10142"><p>The 300 Ultra Mag can grow brass quickly if the shoulder is bumped back excessively during resizing. This can result in the case mouth clamping down on the projectile when chambered. It is inevitable that pressure will increase when the Rd is fired.</p><p></p><p>You may have already thought of this but just try to push a bullet into the mouth of a freshly fired piece of brass that showed unexpected signs of pressure. If you are having growing pains the bullet will not want to go in the hole.</p><p></p><p>You may have marginal clearance in the neck, some of the brass may be thicker than others causing the clearance to be inconsistent. Measure the necks of your freshly fired cases and those of the loaded rds. The loaded rds necks should be .002 or so smaller than the fired ones.</p><p></p><p>Those are the simple fixes, if one of these are not the problem you may have some very bad juju creeping upon you.</p></blockquote><p></p>
[QUOTE="Augustus, post: 901012, member: 10142"] The 300 Ultra Mag can grow brass quickly if the shoulder is bumped back excessively during resizing. This can result in the case mouth clamping down on the projectile when chambered. It is inevitable that pressure will increase when the Rd is fired. You may have already thought of this but just try to push a bullet into the mouth of a freshly fired piece of brass that showed unexpected signs of pressure. If you are having growing pains the bullet will not want to go in the hole. You may have marginal clearance in the neck, some of the brass may be thicker than others causing the clearance to be inconsistent. Measure the necks of your freshly fired cases and those of the loaded rds. The loaded rds necks should be .002 or so smaller than the fired ones. Those are the simple fixes, if one of these are not the problem you may have some very bad juju creeping upon you. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Need help troubleshooting 300 RUM pressure issue.
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