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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="brianwinzor" data-source="post: 363942" data-attributes="member: 1067"><p>I believe that I have experienced one instance of powder bridging. It occured in my custom .257Weatherby when using Viht 20N29 powder with the Wildcat 156 grain ULD.</p><p></p><p>I had been using H870 and AR 2218 (H50BMG) with the 156 grain Wildcat, but was reaching maximimum pressure at 70.0 grains. This represented a loading density of just 82% with H870, and 86% with AR2218, which is way less than the 95% plus that I prefer, especially when using large cases and very slow buring powders.</p><p></p><p>After some research in various burning rate charts and the ADI & Vihtavouri loading manuals, it appeared that Viht20N29 was slower burning than H870 & AR2218, so I decided it was worth a try. I started with 69.0 grains of Viht 20N29, and my first and only shot produced smoke and a jammed bolt, that required my rubber mallet to open it. I immediately wondered whether I had a batch of 20N29 that was much faster burning than normal, or whether it was my first experience of powder bridging.</p><p></p><p>I contacted Kirby Allen, and he believed it was an instance of powder bridging, but I was not completely convinced as I had already fired over 200 shots with AR 2218 with the 156WC with not a hint of spiking pressures. I also used AR 2218 in my .224 Clark with the 100 grain WC without any hint of spiking pressures.</p><p></p><p>After measuring the granule size of both AR2218 and Viht 20N29 powders, I found that Viht 20N20 was slight longer but thinner. However, there did not seem to be a dramatic difference between the two, as AR 2218 measured about .080 in length and .060 in diameter, while Viht measured about .093 in length and .052 in diameter.</p><p></p><p>About a fortnight ago I tried AR 2218 and Viht 20N29 in my newly acquired 300 RUM and there was not a hint of spiking pressures when using 100% loading density loads with both the 180 grain Nosler BT, and Hornady 208 grain Amax. </p><p></p><p>I will now try and find some 240 grain Sierra MK's to see what difference there is in burning rate between the two powders, and hopefully experience no powder bridging problems.</p><p></p><p>It is certainly interesting to hear the circumstances of Kiwi Nate, royinIdaho, and others who have experienced possible powder bridging. Regards, Brian.</p></blockquote><p></p>
[QUOTE="brianwinzor, post: 363942, member: 1067"] I believe that I have experienced one instance of powder bridging. It occured in my custom .257Weatherby when using Viht 20N29 powder with the Wildcat 156 grain ULD. I had been using H870 and AR 2218 (H50BMG) with the 156 grain Wildcat, but was reaching maximimum pressure at 70.0 grains. This represented a loading density of just 82% with H870, and 86% with AR2218, which is way less than the 95% plus that I prefer, especially when using large cases and very slow buring powders. After some research in various burning rate charts and the ADI & Vihtavouri loading manuals, it appeared that Viht20N29 was slower burning than H870 & AR2218, so I decided it was worth a try. I started with 69.0 grains of Viht 20N29, and my first and only shot produced smoke and a jammed bolt, that required my rubber mallet to open it. I immediately wondered whether I had a batch of 20N29 that was much faster burning than normal, or whether it was my first experience of powder bridging. I contacted Kirby Allen, and he believed it was an instance of powder bridging, but I was not completely convinced as I had already fired over 200 shots with AR 2218 with the 156WC with not a hint of spiking pressures. I also used AR 2218 in my .224 Clark with the 100 grain WC without any hint of spiking pressures. After measuring the granule size of both AR2218 and Viht 20N29 powders, I found that Viht 20N20 was slight longer but thinner. However, there did not seem to be a dramatic difference between the two, as AR 2218 measured about .080 in length and .060 in diameter, while Viht measured about .093 in length and .052 in diameter. About a fortnight ago I tried AR 2218 and Viht 20N29 in my newly acquired 300 RUM and there was not a hint of spiking pressures when using 100% loading density loads with both the 180 grain Nosler BT, and Hornady 208 grain Amax. I will now try and find some 240 grain Sierra MK's to see what difference there is in burning rate between the two powders, and hopefully experience no powder bridging problems. It is certainly interesting to hear the circumstances of Kiwi Nate, royinIdaho, and others who have experienced possible powder bridging. Regards, Brian. [/QUOTE]
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