It's the one you have carefully worked up a load for using a suitable bullet and you've sighted in. Mind you, hunting accuracy isn't the same as target accuracy. Two or three inches at 100 yards is accurate enough for most hunting.
However, if you're asking which commercial rifle is best, they're all about equal. The best out-of-the-box accuracy for a reasonable price is a Savage. The model doesn't matter as they're all the same action with different features.