>>76551935
They oftentimes just use FDA or USDA numbers and then kinda ballpark it from there by weight and scale up or down

Brandnames just have a higher liability risk when using wrong labels, the more they sell the more likely its properly controlled as they would use their own researchers to provide a custom (within error margins) calorie count
But its not guaranteed to be correct, you know how they like to manipulate that to appear as best as possible