Yeah it was jackals/vipers. As far as my stats
210 HP
80 AP
7,5,5,6,7,5,5 in S.P.E.C.I.A.L
45 guns, 21 melee weapons, 40 repair, 40 speech
Fast Shot, rapid reload, trigger discipline perks
I use a 9mm pistol but I frequently run out of ammo so I use a varmint rifle.
The game is very easy if you take time to level up. Reaching Nipton by level 3... you must have sprinted through the game not doing any quests and only the bare minimum of fighting.
Also, your setup isn't good. Fast Shot and Trigger Discipline are the opposites of each other; they cancel each other out and actually leave you with a loss of accuracy.
9mm ammo is very common at the merchants, so if you're running low, you could go back to Goodsprings or Primm or the Mojave Outpost for some shopping.
Once you have several hundred 9mm rounds, you can start using that 9mm SMG from Doc Mitchell's house.
Btw, you can find a Grenade rifle for sale at the Mojave outpost. Might help you with them Vipers. Just don't forget to switch to your 9mm after they get close.