How many of you feel that if I'm going to spend money on a double, I should get a double rifle caliber like 9.3x74R and NOT a 30-06?

Looks like due to my California location, custom loads will be needed for hunting either way (solid copper requirements in certain areas) so looks like other than cheaper fun plinking, there's no great advantage. I'm sure there's a chance that I'll go hunting and something happens to my custom ammo and I'd need to get store bought, but that sounds pretty remote.

I guess the 30-06 double rifle will be lighter in weight for easier carrying in the field. I'm really on the fence so love to hear feedback.