I wouldn't be so quick to remove the .30-06 calibre weapons as many nations were still fielding the .30-06 M1919 machinegun for vehicle armament into the 1990s (particularly former Commonwealth nations and also Israel).
Parts for them were still being supplied from the USA up to 1986 and later (I saw 'new' parts from the US in 1985/86 here in Australia, they probably weren't new manufacture but they were unused or refurbished .30-06 M1919 parts as we were and still are, using them as secondary MGs on our M113s).
I believe that all our .30-06 ammo was supplied from the USA as well (and may still be sourced from the US).
That plus the fact that .30-06 is still a reasonably popular civilian shooters round in the US.
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