If the components are of the same quality, and they are assembled with the same care, it isn't a matter of the ammunition being "good" or "poor". If it was, then the same loads should be the most accurate in every rifle, but anyone with any amount of experience is well aware, of that not being true. There is a very good reason that the top ranked target shooters don't all use the same load, for each chambering, that being, that each individual target rifle, prefers a slightly different load. As well, the so called "good" load might shoot poorly in other rifles, and the so called "poor" load might be the most accurate load in another rifle.