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It depends completely on what you are hunting or using your rifle for.
Here is a solid loadout for hogs:
Picrel is an example of a 308 / 7.62 NATO AR-10 build.
Hard reset trigger or NFA full auto conversion for burst fire.
Optics and suppressor of choice, AP rounds if the hog has level IV plates.
2-3x 30 round mags jungle taped to the rifle, extra mags concealed or carried.
If your extra ammo is taped to your rifle, you don't need to carry it on your person.
If you need to carry ammo on your person, you can use your pockets or conceal it.
But if you are going full auto night hunting, can get a cheap minimalist rig for like four extra mags.
You might be able to conceal a chest rig or plates under a shirt or jacket, but only mags look like hunting gear.