I really think it's the shooter and not the gun's price
I certainly agree that more expensive does not mean more accurate,but some rifles are much more accurate than others reguardless of the shooter.I can easily shoot sub 1/2" groups with some rifles,yet I can't better 2" groups or even worse with other rifles.Even a world class target shooter is not going to shoot 1" groups with a 2" gun and loads.Yet even a muchlesser skilled shooter will produce 1" or better groups with a 1/2" gun.