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Rifles, Reloading, Optics, Equipment
Reloading
Check my math/ theory please
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<blockquote data-quote="texan79" data-source="post: 441824" data-attributes="member: 24228"><p>Here's the data: 7mm Rem Mag, 180grn VLD's, 68gr H1000</p><p> </p><p>Now, I dont own a chronograph, so I'm working with Berger's load data and trying to approximate my velocity. In order to achieve the desired energy on impact at 1000 yards, Exbal tells me I need to push this bullet at 2950 fps, so that is my goal.</p><p> </p><p>Here's what I'm working with and my thought process. Per Berger load data in a 24" barrel:</p><p> </p><p>66 gr= 2830</p><p>62.5gr= 2672</p><p> </p><p>Difference of 3.5 grains of powder and 158 fps. Simple math says that 45.143 fps increase with each grain of powder. Using the 66 grains= 2830 as a baseline, I added 90 fps for the 2 grain increase in charge and got 2920 fps. I also have a 26" barrel and figure that I gain about 50 fps over this data.</p><p> </p><p>Therefore, it is my opinion that I am close to where I need to be with this load, energy wise.</p><p> </p><p>Can ya'll confirm or deny this theory/ math for me?</p><p> </p><p>Thanks.</p></blockquote><p></p>
[QUOTE="texan79, post: 441824, member: 24228"] Here's the data: 7mm Rem Mag, 180grn VLD's, 68gr H1000 Now, I dont own a chronograph, so I'm working with Berger's load data and trying to approximate my velocity. In order to achieve the desired energy on impact at 1000 yards, Exbal tells me I need to push this bullet at 2950 fps, so that is my goal. Here's what I'm working with and my thought process. Per Berger load data in a 24" barrel: 66 gr= 2830 62.5gr= 2672 Difference of 3.5 grains of powder and 158 fps. Simple math says that 45.143 fps increase with each grain of powder. Using the 66 grains= 2830 as a baseline, I added 90 fps for the 2 grain increase in charge and got 2920 fps. I also have a 26" barrel and figure that I gain about 50 fps over this data. Therefore, it is my opinion that I am close to where I need to be with this load, energy wise. Can ya'll confirm or deny this theory/ math for me? Thanks. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Check my math/ theory please
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