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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
#####Ballistics HELP (PLEASE)######
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<blockquote data-quote="Broz" data-source="post: 719628" data-attributes="member: 7503"><p>First recheck zero. I recommend you go to a 100 yard zero. Then change the program to 100 yard zero. Reason is if your groups are 1 moa it will leave more room for error at 200 than 100. Then shoot groups at 500, 700, and 900. Record the field conditions. Then record what you dialed for each group and also how low or high the group center was from point of aim. If a group is abnormally large shoot it again. Once you have this data you can figure what you actually needed to be spot on for center group. Example: The center of group at 700 yards was 3 1/2 " low of point of aim. You used 18 MOA for a dial up. 3 1/2" at 700 is 1/2 moa. So you needed to dial 18.5 moa. Record now what the spot on dial ups should be for each distance with those field conditions. Then using G1 BC of .631 change muzzle velocity in exbal until all match within .25 moa. If you can not get them all on, go for making the farthest ones perfect. If you can't get them spot on remember the accuracy error of your combination. (shooting skill, ammo quality and rifle accuracy) </p><p> </p><p>A 5" group at 556 yards is almost 1 moa. That is not great so it might be hard to get all 3 perfect. Once you get it close then with your newly calibrated program shoot some more at differences and fine tune if needed. Remember!! It is better to be 1/2 moa off at 500 yards than 900. Because 1/2 MOA at 500 is a 2 1/2 " miss at 1000 1/2 moa is a 5" miss.</p><p> </p><p>PS: I have used that .631 BC for many .308 cal rifles with 210 VLD's. It has always worked well out to 1200 yards.</p><p> </p><p>My rifles shoot spot on to center of group within the combinations accuracy. That is 1/2 MOA to 1500 on an average.</p><p> </p><p>Yes a slope will make you go high. But it would have to be a pretty steep slope at 556 for 8".</p><p> </p><p>There is a reason I buy powder in the same lot and 40 lbs at a time. </p><p> </p><p> </p><p> </p><p>Jeff</p></blockquote><p></p>
[QUOTE="Broz, post: 719628, member: 7503"] First recheck zero. I recommend you go to a 100 yard zero. Then change the program to 100 yard zero. Reason is if your groups are 1 moa it will leave more room for error at 200 than 100. Then shoot groups at 500, 700, and 900. Record the field conditions. Then record what you dialed for each group and also how low or high the group center was from point of aim. If a group is abnormally large shoot it again. Once you have this data you can figure what you actually needed to be spot on for center group. Example: The center of group at 700 yards was 3 1/2 " low of point of aim. You used 18 MOA for a dial up. 3 1/2" at 700 is 1/2 moa. So you needed to dial 18.5 moa. Record now what the spot on dial ups should be for each distance with those field conditions. Then using G1 BC of .631 change muzzle velocity in exbal until all match within .25 moa. If you can not get them all on, go for making the farthest ones perfect. If you can't get them spot on remember the accuracy error of your combination. (shooting skill, ammo quality and rifle accuracy) A 5" group at 556 yards is almost 1 moa. That is not great so it might be hard to get all 3 perfect. Once you get it close then with your newly calibrated program shoot some more at differences and fine tune if needed. Remember!! It is better to be 1/2 moa off at 500 yards than 900. Because 1/2 MOA at 500 is a 2 1/2 " miss at 1000 1/2 moa is a 5" miss. PS: I have used that .631 BC for many .308 cal rifles with 210 VLD's. It has always worked well out to 1200 yards. My rifles shoot spot on to center of group within the combinations accuracy. That is 1/2 MOA to 1500 on an average. Yes a slope will make you go high. But it would have to be a pretty steep slope at 556 for 8". There is a reason I buy powder in the same lot and 40 lbs at a time. Jeff [/QUOTE]
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#####Ballistics HELP (PLEASE)######
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