I have now conducted some testing on this subject: (Angle Corrected Range - Up/Down Shooting) My findings thus far are as follows: up or down to an angle of 15 º no compensation or very little is required. up or down to an angle of 20 º approx. shot goes 5mm high up or down to an angle of 25 º shot goes 8mm high up or down to angle of 30 º shot goes 11mm high up or down to an angle of 35 º shot goes 15mm high A simple formula is used to work out the Angle Corrected Range Cosine(Degree of Angle) * Measured Range = Angle Corrected Range * = multiplied by I set up at a horizontal distance of 25 yards with an ASLI (Angle Slope Level Indicator) device manufactured by Horus Vision LLC, USA. (manual attached). This device has a scale with the degree of angle on one side & the cosine of the angle opposite it. So the ranges were: 0 º = 25 yards 15 º = 24.14yards 20 º = 23.49yards 25 º = 22.65yards 30 º = 21.65yards 35 º = 20.47yards I have attached an Excel calculator. This is a work in progress. I am writing the code for a web based app that I will eventually include on the Calculators Page of the SWEFTA Website The shot always goes high, only after 15 º, then by increments. From my experience very few Field Targets are set at an angle of more than 25 º & I would say the average is between 5 º to 20 º. I believe (from what I have read about this subject) that as the distance increases from the target the amount that the shot goes high by, increases. At the moment this hearsay for me, as I have yet to test this out on the range. Well I hope this is of interest, it has certainly been so for me.