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Rifles, Reloading, Optics, Equipment
Reloading
Measurement Question
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<blockquote data-quote="woods" data-source="post: 402014" data-attributes="member: 6042"><p>Entirely normal for a factory 300 RUM to have that much jump to the lands. Also common with other calibers such as Weatherby's. It seems that it is becoming more and more common in all factory rifles. </p><p></p><p>Some Weatherby's and RUM's I have reloaded for have as much jump as .275" jump to the lands. This will vary with the bullet as you can load some bullets closer to the lands and still have the same OAL because of the shape of the bullets. IOW you would be able to load a heavy roundnose bullet (if you wanted to) closer to the lands and still have a OAL that would fit in the magazine.</p><p></p><p>A large jump to the lands decreases pressure (all other variables being stabilized) and decreased pressure lessens liability. Personally it aggravates the hell out of me to not be able to seat where I want and still fit the magazine and don't own any rifles set up that way. I do own a 338RUM but it is a custom rebarrel without excess freebore but that means that I have to be careful not to shoot factory ammo or load to manual maxes as it will lose the primer pockets.</p></blockquote><p></p>
[QUOTE="woods, post: 402014, member: 6042"] Entirely normal for a factory 300 RUM to have that much jump to the lands. Also common with other calibers such as Weatherby's. It seems that it is becoming more and more common in all factory rifles. Some Weatherby's and RUM's I have reloaded for have as much jump as .275" jump to the lands. This will vary with the bullet as you can load some bullets closer to the lands and still have the same OAL because of the shape of the bullets. IOW you would be able to load a heavy roundnose bullet (if you wanted to) closer to the lands and still have a OAL that would fit in the magazine. A large jump to the lands decreases pressure (all other variables being stabilized) and decreased pressure lessens liability. Personally it aggravates the hell out of me to not be able to seat where I want and still fit the magazine and don't own any rifles set up that way. I do own a 338RUM but it is a custom rebarrel without excess freebore but that means that I have to be careful not to shoot factory ammo or load to manual maxes as it will lose the primer pockets. [/QUOTE]
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Measurement Question
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