That weight gain sounds perfectly fine.
But depending on when you weighed it may not be 100% accurate. If you weighed the snake "empty"? By that I mean after the snake pooped. That's the most accurate weight you can get. Their pees/poops can carry some weight.
Completely different species, but my subadult Borneo Short Tail Python just let go and after weighing him he lost almost 300 grams of his body weight. Hahhahahaha. Just wanted to give you an idea of how different "empty" weights can be.