Hello, I am having a bit of trouble, and can't quite get it to work for me. I have the load that shoots great in my rifle, and it groups well all the way to 750yds. I want to make a come up card for it. I used the ballistic calculator below to figure things out, but when I tested it in real life, it was slightly off. Close, but not perfect. How do I make the adjustment on the ballistic calculator to tell me the drops for all the ranges? My true drop at 500 yds is 24 clicks or 6 MOA. Not the 5.5 MOA the calculator says.
Below is the calculations that I used originally to get me on target.
Thanks for replying. That's why I'm confused. I am exactly 2.5" high at 100 yds. And I need to go up 6 MOA to be bang on at 500 yds. If I lower the velocity to 2900 fps on the calculator, it puts me at 2.9" high at 100 yds, but I would be adjusting 6 moa up for 500 yds. This doesn't work, since I am keeping my 2.5" high at 100 yds zero.
I'm sure it's something simple, I don't know why I can't get my head around it.
I am 2.5" high at 100 yds.
average velocity for 5 rounds is 3050fps
elevation of 2365 feet above sea level
centre of scope is 1.9" above the centre of the bore
180gr Nosler BT, advertised BC of 0.507
temp. of 60 degrees F
I don't care if my zero is actually 270 yds, that is just what it worked out to be when I made my first range card. I do know that I want to stay at my 2.5" high at 100 yds.
I have spend the last two days walking back and forth to the 1K target doing the same thing as you.
All loads chono'd. Wind and mirage was a bear on day one but I got close. I had to reduce the BC from 0.496 tp 0.43 to get the drop chart work at 1K. Today I got three shots in a no wind condition and validated the 0.43 bc. What a downer that is.
The interesting thing is that the 500 and 800 come ups remained the same with the reduction in BC. Will validate this though.