I recall an article which interviewed a Savage employee.
He said it wasn't any one thing they did that made a Savage rifle shoot well, but a bunch of little things.
Among them, a floating bolt head, which helps center the cartridge in the bore, the barrel nut, which allowed for precise head spacing, adding pillars to each stock, free floating the barrels, etc., etc.
I've never owned a Savage, but have thought about it numerous times, just because they shoot so well.