Gun

As I understood when visiting various artillery museums in Finland, the artillery park of the Finnish army in the last century was distinguished by great diversity and variety. From the high-quality products of the St. Petersburg, Obukhov and other Russian factories of the 1880s-90s; French, Belgian, Czechoslovak and other European brands of different years and calibers, to more or less modern German unified guns. What was it like to supply all this artillery with ammunition?