Plenty. Just stay off the shoulder. It’s better to hit a bear further back than too far forward. A big mechanical will put one down quickly and hopefully leave a good blood trail if needed.
I use an old .22 revolver I got from someone in a trade. Easy to carry in its hip holster and feels like the good old days of playing cowboys and indians (I know that's not PC anymore 😂)
A 180" class head is pretty big.
I have one that's not that big, see my avatar. Of course everything is for sale for a price! Enough to buy a desert bighorn hunt would do the trick!
A quieter bow is more important than a faster arrow if string jumping is a concern.
A heavier arrow will quiet the bow more. Also easier to tune a fixed head with a slower arrow.
Easier to go up in spine to get a heavier arrow, and have the option to add weight up front like a brass/ss insert...
Driving or flying? I have never been checked for anything driving in. Flying a customs officer will ask if you have anything to declare, then wave you through