Or be wise and put points into the perk for finding ammunition.
It's not tricky to have plenty of ammo for your guns.
I haven't been low on ammo since I was about 4-5 hours in on this character.
And eventually upgrading certain weapons to use a different ammunition (like sniper becoming .50cal), means you gain access to a backlog of ammo.
The only ammo you should end up sort of low on is the rare powerful stuff, like 2mm EM Cartridges, Cannonballs and maybe Mini Nukes.
And maybe 5mm, if you use the minigun a lot, in which case you can burn through 1k rounds fairly easily.