How can I find out the current skill levels of my Companions?

Cass has Shotgun Surgeon so I'd like to give her the Riot Shotgun but that requires Guns 100 for optimal performance. She has the Strength to handle it but the Wiki gives her Guns skill as 47 - 100. Does this mean she starts at 47 and levels up through the game to 100? The Wiki also gives her level as 5 - 22. If she does increase in level does this depend on her own actions or is it related to the Courier level? Do her upgrade quests affect these values?

Similarily with Boone. He already does a great job with his scoped Hunting rifle but I'm sure he'd do even better with the Gobi but that requires Guns 75.