The lee loadmaster is an auto progressive meaning that you only put the brass and bullet in the rest is done by the machine.
If the only operations your are doing is adding the brass to the machine and placing a bullet on the brass to be seated you have lost a lot of the processes that make the ammunition accurate.
The best way I can put it for you to understand it is the loadmaster will produce factory spec ammo the same kind of ammo you can but from Winchester Remington etc.
The single stage press or anniversary kit will produce match grade ammo. The single stage press your involved in every aspect of the creation of that round.
you sized and deprime
you seat the primer
you weigh and the powder
you drop the powder
you seat the bullet
In between these operations you take as much time to do prep on the cases or whatever your secretes are to making accurate ammo.
Like said the lee loadmaster will chuck out 500 rounds an hour. I don’t know about you but my range trips I normally fire under 100 .308's Put it this way... I have a Hornady lock and load AP one of the best press for the price around, it makes all my pistol ammo and .233 rifle for my AR... its more then sufficient for shooting on the indoor range where all of these firearms are to be used..
But my .223 bolt action rifle & .308 bolt action rifle are reloaded with my lee breach lock kit. I pay much greater attention to reloading these as I shoot them 600 to 800 yards. They must be precise and I don’t trust the Hornady auto progressive to do that even though it can load both of these rounds.
I use Breach lock kit and the Chargemaster 1500 for my precision stuff.
There is no point in using my lock and load AP and crank out 800 rounds an hour if they dont shoot 1MOA or less at 600 yards
Hope this helps more about understanding what I mean about the loadmaster being less accurate the a single stage press.
These aren’t my videos I would just use them to see how the operation of the two different kits work and less about what the guys are saying about them.
Here is the loadmaster in operation
http://www.youtube.com/watch?v=HGSXa08aUzQ
Here is the anniversay kit in operation
http://www.youtube.com/watch?v=Ut_I1GMm_c4