Seating the bullet out to properly fit the chamber can be a real advantage in terms of accuracy, especially if one is prone to attempting long range shots.

However long the throat is in your chamber, will determine where the bullet should be seated, for best accuracy, that is. Oft times there is not enough room in a magazine, to seat the bullet out far enough to touch or come close to the rifling origins (throat), thus short seating of THAT bullet prevents it from being seated for it's best accuracy potential. Seated to factory specified lengths is safe, but not optimum for accuracy.

The 8x68S is quite awesome as it is, and needs no 'help' in ballistics. There are always tricks like seating out to fit your action, that can help in the quest for accuracy.

If the rifle and/or shooter is only capable of shooting 2" to 3" at 100yards with the use of a bench or table, that combination of rifle and/or shooter is not a 300yard game killing combo, let alone further than that.