They are asking to prove a negative, as a requirement to uphold a Constitutional right.
Judge Rodger Benitez opinion, from the District Court shows all their arguments to be fluff and nonsense.
So does the opinion of the three judge panel.
Here is the 170 page court decision:
https://cdn.ca9.uscourts.gov/datastore/opinions/2021/11/30/19-55376.pdf
For a 10 round magazine to be effective, this criteria must be true
a. all shots must hit their target. (this may necessitate state approved accuracy training)
b. There cannot be more than five targets (for double-tap).
...just for fun