Based on the target dimensions I gave above, I just make up a range card in 50 yd increments out to 850 that has Elevation in MILS/MOA and wind drift in inches for each range increment @ 1 mph.
This way, you can hold or dial if the range is not to extreme.
Example:
You know your target is 2 yds tall (man size) you read 2.5 mils @ target.
2 yards x 1000 = 2000/2.5 mils = 800 yds.
You refer to range card and @ 800 yds it says 24.2 MOA/6.9 Mils
Dial and shoot. Bingo.
When you have wind it takes alot more time, but is very accurate.
You multiply the range wind speed drift of 1 mph (800 in this case) x the actual wind speed, say 10 mph.
The 800 yd line on your card shows 3.3" drift @ 800 for a 1 mph wind.
You have a 10 mph wind so you multiply 3.3 drift x 10 wind = 33" of drift @ 800 yds for a full value wind.
If it is a 3/4 value wind, then multiply 33" x .75 = 24.7" drift.
To get the MOA ajustment divide 24.7" wind drift by distance 8.
24.7 / 8 = 3.08 MOA. to get mills divide your MOA by 3.5.
3.08 / 3.5 = .88 mils.
The wind sounds like alot but it ain't. It can be done in 30 sec. The card is really quick on elevation, the wind takes longer and a calculator is a must for me.
JM
Take the long way to school much??? I can just see you there with your abacus and note pad... "now he's 37.2 yards away in the dark timber and ravine, with a 6.4mph wind at .12 value.... and I only have 7.3mm exit pupil. hmmmm...."
