Re: Figuring your bullet drop for a dope card???
The simplest way to get dope without any ballistic computer or cartridge data is to proceed as follows.
Zero at 100 yards.
Move to 200 and shoot a group, at least 5 shots.
Measure the drop with a ruler to center of the group, convert to the click value of your scope. Dial that on, shoot another 5 to confirm.
Move to 300, and repeat the exercise.
At 400, the drop is enough that shooting with a 300 yards zero will often put you below the average size target backer. At 400, add the same amount you came up between 200 and 300 to your 300 yard zero. For 500, add the same amount you came up from 300 to 400, do the same for 600. At 700, come up the value between 500 and 600 plus half the value, same for 800, at 900 and 1000 add 3/4
For example, you zero at 100 yards. At 200 yards, the 100 yard setting leaves you 4" low. Dial up 2 MOA, shoot to confirm, you should be right on. At 300, your group turns out to be 9" low with the 200 yard setting. Add 3 MOA and shoot to confirm.
Now you have 5 MOA up to shoot at 300. To start at 400, come up the same 3 MOA you came up to get to 300 from 200. With 8 MOA dialed on, shoot a group and correct up or down as required, you'll be within 1 to .5 MOA or so. Let's say that left you 1/4 MOA high, so 7.75 is correct. Come up 2.75 more and shoot at 500. That puts you at 10.5, you find that to be 1/2 MOA low, so 11 is correct. Add 3.25 and shoot at 600. 14.25 turns out to be .75 low, so 15 MOA is correct for 600. At 700, add the 4 MOA differance between 500 and 600, plus half that, 6 MOA total, 21 MOA on the gun.
This process will put you pretty close, withing a minute or so at each range.
I run zeros with my classes this way all the time, it works quite well.
