Factory ammo isn't going to tell you much about the accuracy potential of your gun. I have a Sendero in 300 Win that I'm working up loads for right now. I've done the same for several heavy-barrel Remingtons and all have been similar with regard to accuracy. They'll shoot around 1/2 to 3/4 moa without doing too much load development. Getting them to shoot tighter than that takes some luck or a bunch more work. I would get some Norma brass, H1000, and some 208 ELD-M or 215 Berger bullets and load them to 3.600" OAL. Shoot groups from 74.0 to 78.0 grains at whatever increments you like, and see how she does. You will most likely find a decent load between 76-78 grains.
Before shooting again I would clean your barrel really well. Most of these guns have nice smooth bores but some of them will get fouled after 20-30 shots. Accuracy will take a serious dump when they get fouled so keep it clean when doing your tests. Also pay close attention to your shooting rest and body position. Make them consistent for every shot and make sure your swivel studs aren't hitting anything as you shoot. Harder recoiling guns well exploit any weakness in your technique and you may think its the gun's fault.
Here are some recent targets from my Sendero. I was limited to 85 yards at this range but the groups show something important. This gun liked a milder load of 75 grains, and notice the other groups in the picture. Even with precision handloads the 77.0 grain group was over 1 moa. I have another rifle that shoots the 77.0 grain load very well, so you can't judge a gun based on one particular load.
These rifles are a good value for $1200 and the right handloads ought to shoot 1/2 to 3/4 moa with an experienced shooter behind the trigger. If you expect much more than that you'll likely be disappointed.
