Hmmm, whatever caliber of tube, even pea shooters would be cool... I understand that people have a great fear of REAL Arty....
With good reason...
Also the muzzle blast from heavy Arty was visible for MILES... Even in Daylight... Would make them easy to find...
As a method of use; Why not tie the Arty fire to a spotter plane, or a jeep...ONLY!!! 1 spotter for one Arty Bttry...
L5, (piper cub) spotter plane, or jeep spotter, must have a direct line of sight to the target area...
Kill the spotter, Arty fire stops...
OG