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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Ballistic mil dot question
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<blockquote data-quote="HoytemanPA" data-source="post: 71037" data-attributes="member: 286"><p>I had the same scope. I taped a ruler at 100 yards and read the values in inches of what the hash marks referenced at 100 yards. For that scope, when set to 32 power. The first hash was .25", the second 1.25, 3rd 2.375, 4th 3.625, 5th 5.375, and the post point, 7.5. You could do the same at any power but I went to the common point of "max".</p><p></p><p>With the known value at 100 yards you can then apply data from any number of ballistic programs to determine which line to use. Using the points that I measured above the second hash is 1.25 inches. Plug a 1.25 inch high at 100 reading into RCBS external ballistics calculator or equivalent and when the bullet path crosses line of sight, write that down. This is your yardage for that point.</p><p></p><p>With that scope for example with a 22-250 3700 fps, 55gr NBtip the first hash was 147yd, 2nd 227, 3rd 293, 4th 355, 5th 428, post 505.</p><p></p><p>Good Luck</p><p></p><p>Edited Note: I misread. This was a Burris Signature Series 8-32, and not the Black Diamond so I am not sure if the Bal-Mil Dot is the same as the above figures.</p></blockquote><p></p>
[QUOTE="HoytemanPA, post: 71037, member: 286"] I had the same scope. I taped a ruler at 100 yards and read the values in inches of what the hash marks referenced at 100 yards. For that scope, when set to 32 power. The first hash was .25", the second 1.25, 3rd 2.375, 4th 3.625, 5th 5.375, and the post point, 7.5. You could do the same at any power but I went to the common point of "max". With the known value at 100 yards you can then apply data from any number of ballistic programs to determine which line to use. Using the points that I measured above the second hash is 1.25 inches. Plug a 1.25 inch high at 100 reading into RCBS external ballistics calculator or equivalent and when the bullet path crosses line of sight, write that down. This is your yardage for that point. With that scope for example with a 22-250 3700 fps, 55gr NBtip the first hash was 147yd, 2nd 227, 3rd 293, 4th 355, 5th 428, post 505. Good Luck Edited Note: I misread. This was a Burris Signature Series 8-32, and not the Black Diamond so I am not sure if the Bal-Mil Dot is the same as the above figures. [/QUOTE]
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