First, Sight in spot on at 200m, then get where the shots print at 100 and 300 without dialling.
If you get out to 500m, start by firing a group with the sights set to 200 and note where they fall on the reticle at a good hunting power like 10x 0r 12x then you'll have a baseline for holdover. Measure the drop in inches and use that to calibrate any ballistic program you use (adjust the muzzle velocity to fit observed real drop). Next if you've got enough ammo dial the sights up and trial and error till they are hitting center elevation (don't worry about wind - thats just learning) Write down at the time or photograph how many minutes show on the dial. That is what you'll refer to when hunting. It will also test whether the scope really moves MOA, inch per hundred yards or what. I don't bother to count clicks (can only count to 5 under pressure) just look at the dial.
If you've got heaps of ammo, one day make up a life size tahr silhouette from corrugated cardboard and try holding over on it to see if you can get killing shots. The 7mm Rem Mag is the best commercial calibre for doing this.
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