Michael, yes this is CA compliant. Single-shot pistols that are top-break or bolt-action with a barrel length of at least 6 inches and have an overall length of at least 10½ inches are permitted. It does not need to be on the DOJ roster. Have a great day sir! budsgunshop.com/feeds/state_reg/california_restrictions.pdf

it is CA compliant and legal even though it is not on the CA DOJ approved list. as a single shot it is exempt see ****✔ *********Single-shot pistols that are top-break or bolt-action with a barrel length of at least 6 inches and
have an overall length of at least 10½ inches are permitted. budsgunshop.com/feeds/state_reg/california_restrictions.pdf

Yes, this is California compliant/legal. Hope this helps.

No there are currently no handguns chambered in 6.5CM on the CA DOJ Approved handgun roster

Michael, yes Sir, this would be legal in California. Cheers and stay safe!