Someone who actually hunts in CA with airguns should chime in, but last I looked at the regulations it was airguns for small game only, not for large, and kind of haphazard, when mentioned at all. How about something based on that long standing thread about minimum fpe, starting here:https://www.gatewaytoairguns.org/GTA/index.php?topic=27855.0?There are 9 pages of posts so far, and some interesting discussion. One proposed rule of thumb that seemed neat and handy was one FPE (on target, not at the muzzle) per pound of animal weight, with 5 fpe being a minimum.There was some discussion about that rule maybe being overkill at higher weights, but then some other discussion about more penetration being needed with bigger animals, so in the end that rule of thumb should at least offer enough for humane kills. In order to get higher fpe one would generally need a larger caliber so caliber might take care of itself.