Weakening charges – states a range of 450, but only moves around slightly less than a dodge, which is stated to be a distance of 300. This can be easily tested by attempting to use it at it’s max range according to the red bar under the skill’s icon.
Weakening charges also states that it hits 3 times, but each strike has a tiny range. Combined with the forward movement of the skill, typically only 1-2 of the hits will land unless you’re at a very specific distance from a large target. Compare this to dust strike where it specifically states it has 3 impacts, allowing for multi-hits at specific ranges.
Dust strikes will not land any hits at the max of it’s range (indicated by the red bar under the skill.)
All distance values were obtained by comparing the range of each skill against each other, so I may have the actual values mixed up due to their inconsistencies.