What??? How in the world could a tank gun possibly shoot down an antitank missile? Richard, your penchance for unsubstantiated hyperbole surprises me time and again.
sagger ATGM like all the ATGM developed and enter service (like french SS10,harpon,UK vanguard) in the late 50's and early 60's are very slow. velocity of 200 meter plus /sec.
the report of merkava tank shoot down incoming sagger missile occur during 1997,first reported by JDW.merkava FCS incorporate automatic tracking.by luck,alert gunner could used FCS auto tracking to track and engage the missile.