This is incorrect. It loses to SKC at all target defense and critical rate levels and this disparity increases as SKC is refined because it is 1 star higher than Karacha.
Karacha is actually a horrible crossbow because even a Catacombs Shooter will beat it at 60% critical chance. It deals 30.6 average damage more than a Catacombs Shooter if you can maintain 90% critical chance.
The only time a Karacha will beat a Superior Kracked Shooter is when both are unrefined (+0) and you have 100% Critical Chance, point at which the Karacha deals 4.5 more damage.
Consider also that, for the price of 1 Karacha Crossbow, you can get multiple Superior Kracked Shooters and briquette them for +10% Min/Max Attack.
If youâd like proof:
You take Karacha Crossbow only if you are a Rogue and want to make use of the set bonus. For any other archer and in any other scenario, it is actually a damage loss.