“...longest serving military cartridge...”
Believe it was introduced around 1890 or ‘91.
Got our .30-06 beat by 16 years...
That’s typical Russian, though - If it works, use the living Hell of it until it doesn’t work anymore.
Can’t fault them on that...
Model 1891, updated in 1930 (model 91/30), main battle rifle of the Russian and Soviet armies thru 1945 and still in use today.