New Vegas, Silver Rush?

Ok, so Im level 22 and I walk into the Silver Rush and the guards tell me to wait that there is a meeting. So instead of going to the owner I am browsing the wall to see what I want to steal and I jumped past the guards to see what was on the other side and they all FLIP out. So instead of killing them I try to run outside before Boone can do them in. But now they follow me out, the door guy joins in and trys to kill me as well. Run into the casino across the street thinking they wont follow me that far... they did. So I show them my Gauss Cannon and kill them all. But I dont really want that to happen. I want to be able to use that store as a hub to buy my ammo. I didnt kill the owners or anybody other then the five guards (door guy included). Will they ever let me buy from them? or am I pretty screwed