How SB2845 integrates with other laws.
Currently HRS 134-4 "Transfer, possession of firearms" allows the loan of long guns to adults for up to 15 days.
Currently HRS 134-5 "possession by licensed hunters and minors" allows minors of 16 years and up, to possess and transport firearms and ammunition for hunting and target practice on their own.
With SB2845, doesn't address 134-5, so technically still would allow for hunting and target shooting with a loaned long gun and their current stockpile of ammo. However they would not be able to acquire more ammunition, even from their parents. It's in a grey area.
Nevermind, the law bans possession under 21 so that person wouldn't be able to keep it at home, and must discard or have his ammunition confiscated.