Before you go any further, before you buy any more gadgets, reloading supplies or magic bullets, you need to verify that your optics are not the problem. The best ammo in the best barrel, in the best stock with the best trigger won't shoot consistant, if your scope won't hold zero. No brand is above suspicion with me, I seen the best go bad.
I've fixed more "bad barrels" by replacing scopes than any other way.