First, you did not mention how you were doing the site in. Not to be skeptical but, are you sure it's not you moving the point of impact? Are you shooting off sand bags or some other solid rest? What type of ammo are you shooting? Often times matching the ammo that your gun likes is a process.....not every box of cartridges is going to clover leaf the target.
I would make every attempt to take the human element out of the site in....that's first. A lead sled is great for doing this.
Second, if you determine that the scope is bad, I would look to get an adequate replacement. I gather you're on a budget so here's my recommendation. This is a nice USA built scope that is now owned by Leupold. I find Redfield to be a quality product.