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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Powder Bridging for Kiwi Nate & Tang et al
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<blockquote data-quote="Kiwi Nate" data-source="post: 363548" data-attributes="member: 8533"><p>Your description of 'log jamming' sounds feasible. I have loaded plenty of cartridges to the brim followed by the big crunch and never had a problem but it would be ignorant to assume that such a problem doesn't or couldn't exist. All I can go on is my own experiences. I could only guess that it is a problem that is more likely to occur in .224-6.5" high power cartridges due to the physical size of slow burning powder kernals versus the inside neck diameter of the case. </p><p> </p><p>The problem I was trying to address was relative to the underloading of fat case/ small bore ratio cartridges. The 7mm RUM produces huge problems below 90% capacity. This is definitely going to catch out a few people over the next few years and is something that has not been addressed by Remington.</p><p> </p><p>As another example of directional ignition or detonation as it has been called, Australian gun writer Nick Harvey built a .25WSM a few years ago and had similar problems. The powders/ loads that filled the case to 95-100% full were safe, anything less was dangerous. </p><p> </p><p>I have twice had clients bring locked up rifles to me from one other mistake pertaining to powder. In both instances, the wrong powder was used, a fast burning powder, loaded to 90% capacity in (by coincidence) two seperate .30-06 rifles. The bolts were locked up, brass ruined but otherwise, the rifles survived- just.</p><p> </p><p>Its an nteresting topic, I hope someone else can chime in with their own experiences with pressure problems.</p><p> </p><p>Nate.</p></blockquote><p></p>
[QUOTE="Kiwi Nate, post: 363548, member: 8533"] Your description of 'log jamming' sounds feasible. I have loaded plenty of cartridges to the brim followed by the big crunch and never had a problem but it would be ignorant to assume that such a problem doesn't or couldn't exist. All I can go on is my own experiences. I could only guess that it is a problem that is more likely to occur in .224-6.5" high power cartridges due to the physical size of slow burning powder kernals versus the inside neck diameter of the case. The problem I was trying to address was relative to the underloading of fat case/ small bore ratio cartridges. The 7mm RUM produces huge problems below 90% capacity. This is definitely going to catch out a few people over the next few years and is something that has not been addressed by Remington. As another example of directional ignition or detonation as it has been called, Australian gun writer Nick Harvey built a .25WSM a few years ago and had similar problems. The powders/ loads that filled the case to 95-100% full were safe, anything less was dangerous. I have twice had clients bring locked up rifles to me from one other mistake pertaining to powder. In both instances, the wrong powder was used, a fast burning powder, loaded to 90% capacity in (by coincidence) two seperate .30-06 rifles. The bolts were locked up, brass ruined but otherwise, the rifles survived- just. Its an nteresting topic, I hope someone else can chime in with their own experiences with pressure problems. Nate. [/QUOTE]
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