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The Basics, Starting Out
New guy loosing his mind from load data
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<blockquote data-quote="Barrelnut" data-source="post: 1227033" data-attributes="member: 74902"><p>Yea, guess I'm saying that's it is probably correct. They most likely use strain gauges and load till they get max pressure. Which seems to be between 62,940 and 63,400 PSI. If the bullet has a long bearing surface you may hit pressure max before you run out of room for powder.</p><p></p><p>I think the reason the 300 RUM uses 11.9 Gr. and the Wby 10.2 Grs. more to get there is because their larger cases build pressure slower because of all the air space left in the case that gets compressed. So you have to fill the larger cases more to get to max pressure.</p><p></p><p>This is an interesting phenomenon you have recognised here. First time I have seen anything like it. I'm not a expert loader or expert on internal ballistics or anything, so I am really just trying to explain it based some rather simple basics and taking faith that the info they provide it correct.</p><p></p><p>Seems a 220 MK wouldn't be a very efficient bullet for a big 30 Cal magnum.</p></blockquote><p></p>
[QUOTE="Barrelnut, post: 1227033, member: 74902"] Yea, guess I'm saying that's it is probably correct. They most likely use strain gauges and load till they get max pressure. Which seems to be between 62,940 and 63,400 PSI. If the bullet has a long bearing surface you may hit pressure max before you run out of room for powder. I think the reason the 300 RUM uses 11.9 Gr. and the Wby 10.2 Grs. more to get there is because their larger cases build pressure slower because of all the air space left in the case that gets compressed. So you have to fill the larger cases more to get to max pressure. This is an interesting phenomenon you have recognised here. First time I have seen anything like it. I'm not a expert loader or expert on internal ballistics or anything, so I am really just trying to explain it based some rather simple basics and taking faith that the info they provide it correct. Seems a 220 MK wouldn't be a very efficient bullet for a big 30 Cal magnum. [/QUOTE]
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The Basics, Starting Out
New guy loosing his mind from load data
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