I can only speak for AP cages but the dimensions listed are exterior. Interior is roughly 2 inches shorter depending on the model. For example my T12 (48x24x24) interior height is 22.5 inches.
If it helps I'm using a divider for my little beep who is 159 grams and he's doing absolutely great! Eats, sheds and poops/pees. Like Tttaylorrr said the key is making sure your bp feels secure by having plenty of cover and minimal open floor space. Just remember the biggest threat to a bp is being attacked from above and being exposed in the open with no shelter. So make their travel path from point A to point B feel like a safe one.
For my cage I sectioned off various areas to appear smaller and more cramped with lots of clutter. He also has 5 hides. It's more work but I have no doubt a 300 gram bp will do well in a divided 48 long cage when set right.









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