Hey

It's VERY different how fast bp's put on weight. As you already know.. But to compare I can tell you about my males..

My Spider and YB males weighted around 400-500 gram when they were around 4 months old. But these 2 guys are monster eaters, they eat everything served! I also have a Cinnamon male, he's not a very good eater, and only weights around 400 gram, though he is 8 months old.

So to my knowledge 4 months and 300 gram is just perfect