As for savng yourself weight, I doubt it.
As for success, it totally depends where you're going, how good of a hunter you are, and what's in season. The days of buying a rifle and walking into the woods to live off the land are long over. There are many technicalities you need to know.
Judging by your question, I'd assume you don't hunt. Apologies if I'm wrong.
Do you have a hunting license?
If not, work on that first. I see you're in SoCal: you'll have to take a hunting safety course (about 8-10 hours) and then go buy a license. The course is about $40 through Turners Outdoorsman. Your license will cost you about $50, tags/stamps are extra. You'll need a stamp for upland game/migratory birds. Rabbit requires no extra fees.
If you're talking about SoCal, a Pak Rifle wouldn't be legal to hunt with anywhere in Los Angeles County- no rifle hunting within county limits (shotgun, archery only).
You need to know where you're going:
I.E., Los Padres is decent hunting but requires non-lead ammo, the only exception being for .22s, which then legally limits you to rabbit. Not legal to hunt bird in this area without using non-lead shot. Then you have to know what's legal to shoot and when.
I hunt SoCal, so I'm happy to give you some pointers, but there's a lot to learn about safety, legality, seasons, etc. I'd start with the basics; take the hunting safety class and get a license (in the meantime shoot at a range) before going and buying a rifle to hunt.