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If your beer is not at final gravity, but you have a good idea of where it will finish, then you can prime taking into account remaining gravity points. See [[Packaging#Final_Gravity|Final Gravity]] for more information.
Alternatively, beer can be kegged and force carbonated, and then bottle filled from the keg using a beer gun or some other device. Anecdotes from some brewers have reported a higher chance of [[Tetrahydropyridine|THP]] production when force carbonating some mixed fermentation beers (see the [[Tetrahydropyridine|THP]] page for more information). See [[Packaging#Package_and_closure_types|Package Types]] below for more information on kegging in general.
CO2 levels in bottles can be measured with special equipment. For example, Allagash uses a [https://foodandbeverage.pentair.com/en/case-studies/allagash Haffmans CO2-Selector]. The pierce model Zahm can also be used to measure packaged CO2 levels (see [https://www.facebook.com/groups/MilkTheFunk/permalink/2210596275635241/?comment_id=2210635192298016&comment_tracking=%7B%22tn%22%3A%22R2%22%7D this MTF thread]).