😁😁😁 NATO standard for artillery shells are 155 MM. U.S Howitzer M777 is way better than Russia 152 MM artillery shells. U.S 155mm shell is equipped with GPS or better known Global Position System. They can also fire Calibur shells with pinpoint accuracy. Like Russian T-90 battle tanks being blown up in Ukraine by Ukrainian drones and U.S Javelin. Russian weapons are paper tiger.