It has been My experience, that if a rifle is well Smith'ed and has quality parts, It will shoot almost everything well. But when/if you load, and find the load that it likes best it will exceed all expectations.
But, the best smith can't make a poor barrel shoot very well. The barrel quality is the heart of a accurate rifle. I have seen rifles that wouldn't shoot 3 MOA until the action was blueprinted and the barrel replaced. With everything trued and the barrel replaced along with a good bedding job the same rifle could go sub 1/2 MOA with proper loading.
Just because you may pay $8,000.00 for a rifle, doesn't mean it will shoot. Start with a quality barrel, then a quality action that is blue printed or precision to begin with, cut a precision chamber and install on a quality stock that is pillar bedded and you should have a rifle that is very forgiving and will shoot most/all ammo well. then load for it looking for the right combo of bullet, primer and powder.
It only takes one poorly installed part or a poor quality component to have a negative effect on accuracy. Unfortunately, there are no guarantees to accuracy. It has to be built in or you have to be lucky.
If you want 1 MOA accuracy, that Is very doable. If you want 1/2 MOA then everything must be right. If you want 1/4 MOA you must work at it with quality reloading and if you want sub 1/8th MOA you have to pull out all the stops and leave no stone Un-turned. the only exception to that is Luck. Sometimes we just get lucky and end up with a 1/4 Minute rifle.
Just My Opinion based on years of experience.
J E CUSTOM