Oh no..not another legal question!???
No offense old painless, I just got off my pedestal about silencers and legalities.
Part of my point was that we have readers from all areas, all ages.
So, first, everyone reading needs to know about legal carry, and possession on Federal lands, parks, etc.
Ok, so assuming it's legal, are you talking for personal protection?
I read a thread within the past month, may have been Tactical/Practical forum about this topic.
-People are stalked and harmed in parks and federal lands.
- It is thought that the badguys may prey in these areas because hikers/backpackers are most likely un-armed, as they are following the laws.
-Judged by 12 or buried by 6 was discussed.
My personal opinion is that if you are in bear country, better make it a nice powerful round. .357, .44 .45, like that. Although bear attacks are still very very rare. If it's grizzly country, your handgun round should probably start with a "4", that's just my personal opinion. If it's Polar bear country, you don't want those beasts within pistol range!

30.06 would be my personal choice. But, for handgun, like sleeping and such, a .44 or .45acp hand-cannon would probably get their attention.
If it's general personal protection from 2 leggers and 4 leggers, I would just make sure it can do the job.
But, I would weigh the threat-level with the legal issues, too.