no your dies are pre packaged, so the shellholders and powder scoops come whether you want them or not - your 7.62 russian- if its the long case, it's 7.62x54, ( the bolt action ww2 mousin nagant)the short one is 7.62x39(ak, sks, and a bunch of others
as far as whether you want the full length resize or just the neck, it depends ON THE RIFLE- bolts you can neck size, but autos pumps and levers must be full length- there's no point in covering this base until you have the rifle in hand and yes, for the 308/06 there's no reason you couldn't have one set in the rgb and the other in pacesetter or deluxe- if you shoot anything but bolt, there's no point in having a neck or collet die
as far as whether you want the full length resize or just the neck, it depends ON THE RIFLE- bolts you can neck size, but autos pumps and levers must be full length- there's no point in covering this base until you have the rifle in hand and yes, for the 308/06 there's no reason you couldn't have one set in the rgb and the other in pacesetter or deluxe- if you shoot anything but bolt, there's no point in having a neck or collet die