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Hunting
The Basics, Starting Out
Determining true BC
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<blockquote data-quote="Forester" data-source="post: 208368" data-attributes="member: 11102"><p>I have been shooting with good results the Hornady 110gr V-Max through my Savage 12FV this spring and have taken a few groundhogs with it so far. I wanted to work out a real drop chart and get an idea of what kind of groups I might expect beyond the 200 yards I have been working at so far so I took advantage of a nice calm morning today...can some of you that are more experienced at this tell me if my logic is valid here?</p><p></p><p>I first made sure I had the rifle well zeroed at 200yards. I checked my 200 yard groups through the Chrono and got the expected 3145fps with very low ES(5-10).</p><p></p><p>I then moved out to 400 and used a free ballistics program to get close on how much to come up on the scope. After shooting a 3 shot group I adjusted the scope to zero at 400. I shot a group to confirm and had a good zero at 400 yards.</p><p></p><p>I used the actual come up to adjust the BC of the bullet in the program until the programs numbers matched my own.</p><p></p><p>I then moved back to 500 and used my new BC in the program to bring the scope up. Hits were exactly at the correct elevation on target.</p><p></p><p>Heres what I found hard to believe, if I did things right, my actual BC is .286 instead of the .177 claimed by Hornady. it seems hard to believe that my real BC could be 60% higher than what is claimed by Hornady.</p><p></p><p>By the way, groups:</p><p></p><p>200= .41MOA</p><p>400= .44MOA</p><p>500= .38MOA</p><p></p><p>Groups at 200 are round, at 4 and 500 most of the dispersion is windage, very little elevation.</p><p></p><p>Darn good for a (relatively) cheap rifle and Bushnell scope! All I have done is bed the action in the factory stock and open the barrel channel up to make sure it can not touch.</p><p></p><p>Thanks for checking my method!</p></blockquote><p></p>
[QUOTE="Forester, post: 208368, member: 11102"] I have been shooting with good results the Hornady 110gr V-Max through my Savage 12FV this spring and have taken a few groundhogs with it so far. I wanted to work out a real drop chart and get an idea of what kind of groups I might expect beyond the 200 yards I have been working at so far so I took advantage of a nice calm morning today...can some of you that are more experienced at this tell me if my logic is valid here? I first made sure I had the rifle well zeroed at 200yards. I checked my 200 yard groups through the Chrono and got the expected 3145fps with very low ES(5-10). I then moved out to 400 and used a free ballistics program to get close on how much to come up on the scope. After shooting a 3 shot group I adjusted the scope to zero at 400. I shot a group to confirm and had a good zero at 400 yards. I used the actual come up to adjust the BC of the bullet in the program until the programs numbers matched my own. I then moved back to 500 and used my new BC in the program to bring the scope up. Hits were exactly at the correct elevation on target. Heres what I found hard to believe, if I did things right, my actual BC is .286 instead of the .177 claimed by Hornady. it seems hard to believe that my real BC could be 60% higher than what is claimed by Hornady. By the way, groups: 200= .41MOA 400= .44MOA 500= .38MOA Groups at 200 are round, at 4 and 500 most of the dispersion is windage, very little elevation. Darn good for a (relatively) cheap rifle and Bushnell scope! All I have done is bed the action in the factory stock and open the barrel channel up to make sure it can not touch. Thanks for checking my method! [/QUOTE]
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Determining true BC
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