Getting your drop card is very easy.
1) Find the BC of your bullet. Preferably the "Litz" version from JBM.
2) Get a round about figure of what your muzzle velocity should be.
3) Go to JBm and plug those two things in along with bore height.
4) Hit "print".
5) Go to range and get a good 100 yard zero. Loosen and "slip" your turret until the "0" mark is lined up with the index mark.
6) From there reference the chart you printed out from JBM and shoot at 300yds until you have a good zero. Write the number of MOA's or Mils down.
7) Go to the longest range you have preferably 600 yards and do the same as you did at 300 yards. Write the number of MOA's or Mils down.
8) Go back to JBM and move the velocity up or down until it matches what you shot on the range.
9) Hit "print".
You're done.
yep!
and you also get your muzzle velocity without messin' with the chrono.
Frog, You are wrong again as per normal, but formidilosus might have led you astray with #2. Using a chronograph is more critical the longer the range you want to shoot for Extreme Spread and Standard deviation numbers to go along with muzzle velocity.
#2 does not mean that much if you have a E.S. of 50fps.......do your chrono homework.
