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Rifles, Reloading, Optics, Equipment
Reloading
On Paper Vs Ballistic Program
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<blockquote data-quote="gonehuntinmeyer" data-source="post: 163842" data-attributes="member: 4502"><p>I echo what Guy is saying about practice but I understand wanting to know a starting point. I have found that the ballistic calculator that I use is usually pretty accurate but not perfect. When I punch in the info you provided, I get a similar trajectory to what you expected. My calculator takes into account many variables that I had to guess such as elevation, temperature, and scope height. I used my own typical number of 1000 ft. and 70 degrees with a scope height of 1.5 (low mount). I used the more conservative number from Nosler's website of 0.474 for the BC. For this set of parameters and a 300 yard zero, the 100 yard impact should be plus 2.7 inches. A better way to get started is to zero your rifle at the intended zero range and work from there. I would click up 5 clicks and double check the zero and then shoot at the other ranges. I can't explain why the actual is so different from the calculator. Just playing with other parameters to match what you observe would take some drastic changes to the velocity or BC. A velocity of 2950 and a 250 yard zero would be close. A lower BC would require a value of half or less which cannot be the case. It could be combination of things. Anyway, it is critical that you shoot a group at each range to get accurate data. Don't just shoot twice and say that it's 3.5 inches low. A MOA rifle's group at 300 yards is going to be around 3 inches. Good Luck</p></blockquote><p></p>
[QUOTE="gonehuntinmeyer, post: 163842, member: 4502"] I echo what Guy is saying about practice but I understand wanting to know a starting point. I have found that the ballistic calculator that I use is usually pretty accurate but not perfect. When I punch in the info you provided, I get a similar trajectory to what you expected. My calculator takes into account many variables that I had to guess such as elevation, temperature, and scope height. I used my own typical number of 1000 ft. and 70 degrees with a scope height of 1.5 (low mount). I used the more conservative number from Nosler's website of 0.474 for the BC. For this set of parameters and a 300 yard zero, the 100 yard impact should be plus 2.7 inches. A better way to get started is to zero your rifle at the intended zero range and work from there. I would click up 5 clicks and double check the zero and then shoot at the other ranges. I can't explain why the actual is so different from the calculator. Just playing with other parameters to match what you observe would take some drastic changes to the velocity or BC. A velocity of 2950 and a 250 yard zero would be close. A lower BC would require a value of half or less which cannot be the case. It could be combination of things. Anyway, it is critical that you shoot a group at each range to get accurate data. Don't just shoot twice and say that it's 3.5 inches low. A MOA rifle's group at 300 yards is going to be around 3 inches. Good Luck [/QUOTE]
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On Paper Vs Ballistic Program
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