Thread: Sighting 200 yards at 100 yards

That rule depends on sight height and the particulsr rifle calibre and load. As far as I recall the old original "rule of three" applied to .303 with open iron sights. 3" high at 100yards = zero at 200 yards and approx 3" low at 300yards using military 174 grain ball ammunition. The true drop at 300 was .ore like 8" but for a body shot at a red deer it was good enough. The height of a scope mount above the bore wil alter the rule numbers considerably.