So I spent a lot of time to put together an artillery table for Russia and the USA. Currently Ukraine is completely missing. My main motivation was that whenever I was putting together an ORBAT, I had no idea about artillery strike call in times and available ammunition. Now I can check and compare it very easily.
I am sharing it with everybody in case also somebody else finds it useful.
Please note there is a sheet for each nation, and everything was recorded with Elite difficulty settings and Regular experience levels (for both arty and spotters).
Link to CMBS Artillery spreadsheet