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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 RUM Barrel Length
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<blockquote data-quote="jwp475" data-source="post: 165437" data-attributes="member: 3776"><p>H869 is too slow in the RUm with any barrel lenght when compared to Retumbo with a bullet as light as the 190 grain. Move up to ,say a 240 grain SMK and then h869 will give faster velocities than will Retumbo.....JonA got up to 3000 fps with H869 and the 240 SMKs about 200 fps faster than Retumbo ( if my memeory is carrect) Case capacity for the bore size and bullet is the determining factor for powder burn rate not barrel lenght..</p><p> I talked to Tye at Barnes yesterday about when all of the powder is burned and he said that he ands theier ballistics engineer have talked about this recently (they have read JBs article also) and they are not sure that the powder is completly burned in the first 3 or 4 inches...Tye is going to conduct a few experiments to see if he can get a better idea if this is true or not......</p></blockquote><p></p>
[QUOTE="jwp475, post: 165437, member: 3776"] H869 is too slow in the RUm with any barrel lenght when compared to Retumbo with a bullet as light as the 190 grain. Move up to ,say a 240 grain SMK and then h869 will give faster velocities than will Retumbo.....JonA got up to 3000 fps with H869 and the 240 SMKs about 200 fps faster than Retumbo ( if my memeory is carrect) Case capacity for the bore size and bullet is the determining factor for powder burn rate not barrel lenght.. I talked to Tye at Barnes yesterday about when all of the powder is burned and he said that he ands theier ballistics engineer have talked about this recently (they have read JBs article also) and they are not sure that the powder is completly burned in the first 3 or 4 inches...Tye is going to conduct a few experiments to see if he can get a better idea if this is true or not...... [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 RUM Barrel Length
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