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Rifles, Reloading, Optics, Equipment
Reloading
300 RUM load development questions
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<blockquote data-quote="7stw" data-source="post: 746780" data-attributes="member: 22854"><p>First things first! Your runout issue, is probably q result of your resizing process, and it is hard at times to correct it. Typically what happens is when you resize, and when you pull the expander ball back through the case, it sometimes " pulls " the neck a little out of square, or centerline, with the body of the brass. So, then when you seat the bullet, it is then exaggerated. You need to ensure that your expander ball is dead center of your die. Also , lubricate the INSIDE of the neck before the resize stage, that way, the expander will not bind, and that's usually what starts the distortion. </p><p>As to the jump, when I used to load VLD's in my RUM, I loaded to box length, then manipulated the load in small increments to find the "sweet" spot. The RUM is free bored by design, and unless you are single feeding, you can not touch or come close to the throat, and still fit into the box. </p><p>Read your instructions that came with your dies to ensure you are centered correctly with the expander, and that will help out a lot. Good luck, and enjoy the ride.</p></blockquote><p></p>
[QUOTE="7stw, post: 746780, member: 22854"] First things first! Your runout issue, is probably q result of your resizing process, and it is hard at times to correct it. Typically what happens is when you resize, and when you pull the expander ball back through the case, it sometimes " pulls " the neck a little out of square, or centerline, with the body of the brass. So, then when you seat the bullet, it is then exaggerated. You need to ensure that your expander ball is dead center of your die. Also , lubricate the INSIDE of the neck before the resize stage, that way, the expander will not bind, and that's usually what starts the distortion. As to the jump, when I used to load VLD's in my RUM, I loaded to box length, then manipulated the load in small increments to find the "sweet" spot. The RUM is free bored by design, and unless you are single feeding, you can not touch or come close to the throat, and still fit into the box. Read your instructions that came with your dies to ensure you are centered correctly with the expander, and that will help out a lot. Good luck, and enjoy the ride. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
300 RUM load development questions
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