Around 275, mine are usually on weaned rats (30g to 45g depending on batch).
Pinkies and fuzzies are too small for him at that size.
If you feed him one weaned rat (or comparable sized chick) a week, it'll probably take 2.5 to 3 months or so to get him to 500g. At that point you can either switch him to small rats (45g to 70g usually) or just leave him on weaned rats once a week until your next shipment is ready to be ordered.
I feed less than most people do, but if it was me and I was ordering 6 months in advance at that size, I would just get a bunch of weaned rats and chicks. Maybe throw in a few small rats if you want.
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