In early 1960s we adopted new SMLEs in 7.62x51mm and replaced our .303. Then came SLRs in the same caliber and not just being a standard issue rifle of army, it was also procured by police and CAPFs. To supplement the SLRs we adopted Bren Guns in 7.62x51mm, still our standard issue LMG. Then came FN MAGs or as called locally MMGs, from platoons to tanks to bunkers, everyone got a MMG in 7.62x51mm. Replacement of both Bren and MAGs; some 40 thousand machine guns are also supposed to be in 7.62x51mm. Not to mention whenever we'd replace SVDs it would be in 7.62x51mm only.
But ya, I do sometimes wonder whether there's enough ammo to sustain them for the next decade or not. Especially when we've started not just manufacturing NATO spec ammunition but exporting them to USA.