Have any of you guys had experience with making a big bore larger than .600 in California? I have been interested in the .600 Overkill. I have been told that it isn't legal to do so, even if it is can be proven to be similar or based of a Nitro Express round. It seemed like nobody I talked to wanted to explain how I would go about proving it is for sporting use, or even if this would make a difference. Thanks for the help.