It is fine. My males around that age averaged around 190-300g. They were all purchased at different times and ages. Breeders tend to feed less to cut costs on the food on the animals they do not plan on keeping. If you got him when he was 2 months old (or older), more then likely he was fed once a week on smaller prey then you are feeding him now (which is what by the way?).
My youngest male who is 3 months old weighs at 156g. Meaning if he is constantly fed the way I am going now, he should should weight in around 290-300g at 6 months old. People who breed may actually over feed animals (not all of course) to get them heavier faster. I have seen a 3 month old BP reach 300+g. And by 6 months old, breeding at a weight of 600g. I do not agree to this but some people do do it.
My male's hatching weight though was 81g. I have a female who weighed in at 60g when born, 2 weeks younger then the male, at 2 1/2 months old, she weighs in at 123g. Much smaller then the male. They are fed the same and her lesser weight has to do with her birth weight. SO feeding, and weight at birth has a lot to do with just how much a BP will weigh at certain times. At 6 months old, this female will probably only weight 210-250g give or take.