Yep, banded Cali King. Pretty too.

When you say 10 mice, was that each week or each Month??? If the former, then the snake is very overfed, the latter (more likely) and the poor dear is 'aggressive' because it's hungry!

Also, of the Kingsnakes Cali's are known to be the most prone to aggression. But the striking in the cage leads me to believe that this guy fed that poor dear once a month and it's always looking for food.

See what happens when you get him on a proper weekly schedule of ONE, two at most, adult mice at a time. NO Kingsnake should ever be so large that it would need more than 2 large mice at a single feeding.
I predict that after a month or two of weekly, regular feedings and short but regular handling (AFTER the first three feedings), he should calm down for ya.
If not... well we'll burn that bridge when it comes.