For hunting with my 7mm: 3 in the mag with 1 in the chamber, 2 in each pants pocket, 2 in each coat pocket, 8 on my pack belt which gives me 20 on my person. 1 box in the truck, 1 box in camp. 60 rounds total.
At home there's a few hundred rounds loaded up for the 7mm alone. I shoot 300 - 400 rounds per year with my hunting rifle.
Since I take a shotgun everywhere in the bush I have a box in the truck that contains: 20 birdshot, 10 00 buckshot, 10 Federal Deep Penetrator slugs and 10 comet flares.
I have a few thousand rounds stocked up for all my calibers combined. Buy it cheap, stack it deep.