Wind Solution Wrong

Overall, a very good program, but with a serious flaw. The solution for wind lead is incorrect.

The system wrongly calculates wind lead from your zero setting range (mine is 200 yrd.). Instead, it should calculate total lead from muzzle to target.

The program does, as it should, have 2 separate settings for wind; one when you zeroed the gun initially, and the other for wind condition at time of shooting. But they dont compute the difference correctly for lead.

I sighted my gun at 200 yards and entered 0 wind speed and logged this into Isnipe. The resultant ballistic table appears theoretically correct. The problem occurs when you enter the 2nd wind condition for the time of shooting.

Enter, say a 15 mph crosswind from 9 oclock, and the resultant solution shows ZERO wind drift at 200 yards. The tables indicate the negative amount of lead up to zero, and the positive amount after zero. To get true lead, out to an example of 350 yards, one would need to add the amount of total negative lead from 0-200 (as a positive number) to the lead noted at 350 yards.

The program also fails to report correctly, when the user asks it to calculate and show the reticle solution for a specific distance, in lieu of using the tables. It will show NO lead at 200 yards, regardless of the daily wind speed you select. And the amount of lead at any distance past 200 will be incorrect, as it does not include the accumulated lead up to 200 factored in.

The system should compute the TOTAL DIFFERENCE from the wind condition noted at zeroing, and the daily wind entered.

308 SASS about iSnipe, v4.0.5