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.

Originally Posted by Woody

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.

the rule of three has been posted above......scope sighted rifle with assumtion scope is 1 1/2" above bore.