While not actually finding any info on the number of rounds (a good find there Chico) I did read some articles that indicated that just like firearms, ammunition type plays a big part in the service life of artillery barrels. Some older ammunition types were accepted as being corrosive and the introduction of newer types meant longer barrel life.
To be very generalized, I think that if the GM decides an artillery piece has been well used then it will have some accuracy & range limitations but if the piece has seen 'average' use then it can probably continue on without needing a barrel change (particularly given the limited opportunities to fire it once the war has ended)
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