Another way to skin this cat, using MS paint.
Copy and pasted from another forum
So tonight I was screwing around on MS paint and was screwing with the scaling tool and a hard core idea took over. You can edit the size of the "canvas" in pixels to be 850 x 1100 pixels (to scale with an 8.5x11" sheet of printer paper). Then each pixel is equal to .01".
Next, measure the diameter of your turret where the numbers are. Multiply that by Pi. That will give you the circumference of your turret, we'll call it "W" for width.
Measure the height of that area where it remains a perfect cylinder (no bulges, knurling, tapers etc.). Call that value "H" for height.
Now make a box in MS paint, W x H.
Go on JBM ballistics or whatever ballistics calculator you want and get the dope data for every 50yd (or meters) or whatever interval you want at whatever DA or pressure/temp you want.
I set my 100yd "zero" at the far right and left edges of my HxW box (one half one one side, half on the other, a simple line and "0"). Now here's where you might need to use your noggin. You have to determine the distance 1 MOA or 1 Mil or .25 MOA etc. etc.. is on the circumference of your turret. For example, My turret was 0.840" in diameter, Circumference was 2.369". I have 40x, 1/4 MOA clicks per revolution (10 MOA total), so I divided 2.369 by 40 and got 0.066" per 1/4 MOA. Now determine how many clicks it is to each yard line. 200 was 7, 7x0.66= 0.462. Each pixel = .01" so I need to go left from my "0" mark 46 pixels (round down the .2 pixels). At that point, make a vertical line and a "2" or "200" or "catshit" whatever you want to mark it. Rinse/repeat for 300, 350, etc etc..
I did the first-revolution values in white, 2nd in yellow, 3rd in red. If you have enough space, you can stack them (3rd rev above 2nd, 2nd above 1st..) Out to 700yd, every 50yd. My 50yd interval marks are just dots.
Then print it out. Check your printer settings and get rid of all margins. For whatever reason I couldn't zero out all margins, so I set them all (L,R,U,D) to 0.5", then subtracted 100pixels from the canvas height and width. Make sure everything is still to scale in terms of pixels after you do this. with 1/2" margins all around and 750x1000 pixels, 1 pixel is still equal to .01".
