Originally Posted by tommyc279
I have been shooting the american eagle 168grl. OTM and have had amazing groups. The only problems I have been having are my ballistic charts are not working with the real groups. what I am looking for is he bc of this slug and any real data that anyone has on shooting this round. At 200 yards they are perfect and 300 yards they are 2.7 inches low after the adjustments are made. I cant figure out the why this is happening
The trouble you're running into here is the difference between what the 'book' says and reality. What you need to do is some trajectory validation.
Zero your rifle at 100 yards. Then whatever you 'book' says to adjust for 200 yards, make that scope adjustment and shoot a 200 yard group. Then make the 300 yard adjustment according to your 'book' and shoot a group, then 400, 600 and so on. Then go out and measure the difference between the 'book' and the reality. You can now calculate your trajectory and have accurate adjustments for your various distances.
Of course, once you have this validated trajectory, you will have to go out again and check it...just to be sure.