https://us.diablo3.blizzard.com/en-us/item/rabid-strike-P71_Unique_Fist_003
Rabid strike should be the only weapon without a guaranteed damage range stat. For all other weapons, the damage range is stated as a guaranteed stat. You can check all other weapons in the game guide.
For example.
https://us.diablo3.blizzard.com/en-us/item/kyoshiros-blade-P4_Unique_Fist_102
One of 7 Magic Properties (varies)
+[981 - 1199]-[1175 - 1490] Poison Damage
+[981 - 1199]-[1175 - 1490] Cold Damage
+[981 - 1199]-[1175 - 1490] Lightning Damage
+[981 - 1199]-[1175 - 1490] Damage
+[981 - 1199]-[1175 - 1490] Holy Damage
+[981 - 1199]-[1175 - 1490] Arcane Damage
+[981 - 1199]-[1175 - 1490] Fire Damage
Some weapons roll only a specific damage range element.
Rabid strike could be bugged. If i remeber correctly there was a patch that added the damage range stat as a guaranteed stat. But the change got reverted with another patch.