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Rifles, Reloading, Optics, Equipment
Reloading
Anyone know where 8208 powder is?
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<blockquote data-quote="adamjp" data-source="post: 2838493" data-attributes="member: 40749"><p>The size of the granule, the type and amount of coating, the micro fissures within the granule are the things that change burn rate, reaction of that burn rate to pressure and heat, and volume are the things that products like Quickload seek to model. FWIW AR2209 and AR2217 (H4350 and H1000 respectively) are identical to look at - exactly the same size. Burn rate, temperatures and pressure reaction are quite different.</p><p></p><p>The short version is, don't just use Ba as it will lead you astray. Progressivity (and all else in the right sub-window), and case capacity and weighting factor all affect how a chemical composition will burn in a given volume. It annoys me when people say 'play with Ba to match measured velocity' as the model is far more complex than that.</p><p></p><p>Having worked with those powders for more than 40 years (back when 2206 and 2210 were a thing) the closest you will get to 8208 is BM2, but it is a little faster.</p><p></p><p>8208 was a batch worked up to deliver the best burn characteristics for 5.56 ammunition in the F88 AUSSteyr, and subsequently the F89 Minimi. When Hodgdon sought a certain set of characteristics to match the old Thunderbird powder, the factory at Mulwala was able to reach into the records and find a composition with matching characteristics.</p><p></p><p>8208 is still being made, but at a reduced capacity due to other pressures on the facility (it is a government owned facility, operated by Thales, and is responsive first to the demands of the Australian government).</p></blockquote><p></p>
[QUOTE="adamjp, post: 2838493, member: 40749"] The size of the granule, the type and amount of coating, the micro fissures within the granule are the things that change burn rate, reaction of that burn rate to pressure and heat, and volume are the things that products like Quickload seek to model. FWIW AR2209 and AR2217 (H4350 and H1000 respectively) are identical to look at - exactly the same size. Burn rate, temperatures and pressure reaction are quite different. The short version is, don't just use Ba as it will lead you astray. Progressivity (and all else in the right sub-window), and case capacity and weighting factor all affect how a chemical composition will burn in a given volume. It annoys me when people say 'play with Ba to match measured velocity' as the model is far more complex than that. Having worked with those powders for more than 40 years (back when 2206 and 2210 were a thing) the closest you will get to 8208 is BM2, but it is a little faster. 8208 was a batch worked up to deliver the best burn characteristics for 5.56 ammunition in the F88 AUSSteyr, and subsequently the F89 Minimi. When Hodgdon sought a certain set of characteristics to match the old Thunderbird powder, the factory at Mulwala was able to reach into the records and find a composition with matching characteristics. 8208 is still being made, but at a reduced capacity due to other pressures on the facility (it is a government owned facility, operated by Thales, and is responsive first to the demands of the Australian government). [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Anyone know where 8208 powder is?
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