This is a good read:
The book which I am unable to recall ..was written with direct survivor Interview from Israels Barak Brigade of the Golan sector during the Yom Kippur War.
A short account of determination under fire.
Yom Kippur war account
Am not certain as research goes for the period of 1967-1973 as per Israeli ordinance.
The Centurion and other IDF tanks fielded the NATO standard 105mm tube.
what is know..is that by 1982..IDF had R&D's the 105 mm round..and enabled it to punch hard at great range by increasing its kinnetic energy profile and flight dynamic.
The IDF 105 mm round could engage a Soviet 120mm T-72 before its target aquistion was workable as distance goes.
The armor of the T-72 was no match for the 105 round...this was especially seen in Lebanon in 1982.
Israels early Merkava series stayed with the 105 tube.
..now decades later..Israel is well into the 120 mm tube with their own design muni's.