"155 mm" is a very widely used calibre for artillery guns and their corresponding artillery shells.
155-mm De Bange canon Mle 1877
M107, M795, M483A1 155 mm projectiles
The Panzerhaubitze 2000, meaning "armoured howitzer 2000" and abbreviated PzH 2000, is a German 155 mm self-propelled howitzer developed by KNDS Deutschland and Rheinmetall in the 1980s and 1990s for
155 mm caliber
…France CAESAR GCT Germany Artillery Gun Module PzH 2000 Germany / United Kingdom / Italy FH70…
Lithuanian Panzerhaubitze 2000 from the front
Panzerhaubitze 2000 – Bundeswehr Military History Museum, Dresden
Lithuanian Army PzH 2000 firing