yeah it doesnt have much ammo, and mostly if u r used to 1st person shooters and use some weaps who drain ammo like .. i made my 1st run in NV on HCmode and didnt rly had ammo problem, i would tell the other way around 1. i was playing 9mm -> 10mm -> cowboy repeater -> .44 -> aer 14 -> myst magnum, mostly targetting heads "quick solution" 2. i thought that there could be ammo problems so from start till end i was picking / buying ammo where i could, and about every few days i made stop in novac to put my items there so i would reset weight and did trade route novac -> primm -> mojave outpust -> 188 TP (here u find 3 merchants) -> crimson caravan company -> gun runners -> freeside (van graffs, mike..) hidden valley.. and some other after trade route i needed to go to novac again to lower weight, sleep for xp bonus and back to "work" =) if u dont have high barter, before u will do some big trade somewhere drink some alcohol for +charisma and use barter magazine (buut not waste em, later u would need them for barter speeches) to weaps / armors dont sell if bellow 40% but "repair" still depend on your repair skill but if its decent u can do nice money from it f.e. in whole trade rte buy all weaps bellow 20% and repair for caps as end with jury rigging u just cant have problem with money thats almost cheat perk repair displacer / ballistic gloves repair with 20caps knuckles to get ~6k eeeehhhmmm 3. as for companions, they need ammo if u give them "your" weapon, but u pretty much dont need to give em anything and they shoot anyway eeehhm 4. difficulty matters cause the higher u play with less ammo u will have,, cause u get still same ammount but mobs need more bullets to die 5. try to avoid any burst weaps and wear ~3weaps with ammos with u, repair weaps for maxxed dmg prolly told much more than i should, sorry, dont kill me pls, got carried away =) have fun!