BB g?un for practice?
Sure, but it has limits.
I started preparation for a CHL with a BB pistol. Hard trigger, long pull, tough start. It took days to develop the hand strength to empty the magazine. In two weeks I could shoot until the CO2 cartridge ran down- about 85 shots.Then I worked on using the safety lever and holster carry, multiple targets and whatever came to mind. Aiming, pointing, pulling, drawing, lots of good practice
Then I went in the country and shot a borrowed gun to learn about noise and recoil -ouch. Ear protection now. Protective glasses too. It was another layer of learning. It wasn't enough - I failed the shooting test. Back to the country for more practice. I passed then.
The BB gun allowed a lot of practice in the city among the neighbors, otherwise I might never have made it.