No doubt the final ogive setback can make a difference on accuracy, but I don't look at it as a component as such. Choosing the right bullet in the first place will help with accuracy, thus I always liked a spitzer pointed boat-tail type bullet, like the Nosler Accubond, or the Nosle Ballistic Tip. Both have great B.C.'s
Overall the accuracy component is the perfect "powder charge" for your particular combination of components, and barrel. Doing work up loads, I have seen groupings get tighter and tighter, usually as I am reaching close to max powder charge. Sometimes, as the charge gets higher, I will notice the groupings start to spread again, so I know that I need to go a bit lighter, for the best accuracy. It's just a matter of "tuning your loads, for your particular gun.
So I chose powder charge as the best component.
