Primm, Nevada is not a place many spend much time, but in Fallout New Vegas it's one of the first places you get to. In this video you'll find out where to find Lucky, the rare weapon version of the .357 magnum, in the Bison Steve Hotel in Primm.
From the Creator:
You can find Lucky in a Hard locked floor safe inside the Bison Steve Hotel in Primm. Enter the hotel through the main front entrance and proceed east to the gift shop. Behind the cash register on the floor is the safe (requires 75 lockpicking). There is also a copy of Tales of a Junktown Jerky Vendor laying by the safe.