Doug Bowser said:
... the turret has no advantage over a C or O press...
Well I can think of several advantages the turret has over a single stage press:
1) You don't have to put a bunch of brass in loading trays, and then put a funnel over them to fill them up. You do it on the press instead. Fewer manual motions involved.
2) Immediately after you charge the brass with powder, the turret turns automatically so there is no wondering "hey, did I put powder in that brass yet?" and no risk of double charging the case.
3) You never spill powder out of a brass case because immediately after you charge it with powder, you seat a bullet in it. The brass stays in the shell holder the entire time.
4) Changing out dies is easier and quicker because you mount all your dies for a given chambering on a single disc. The whole disc swaps out in seconds without using tools (at least with the Lee Classic Turret this is true).
As far as making accurate ammo, yeah I could probably get a little more precision out of a good single stage press, but I'm happy with the accuracy I get using the turret. For example, I've been shooting a cheap plinker round I threw together for 6.8 -- it's at least a 3/4 MOA shooter in my chrome-lined
AR and I haven't even started to develop this load for accuracy yet. (Neck and TomBomb were practically 100% on the 200 yard bowling pins at the last M&G, despite shifty and gusty winds.) I make this load on a Lee Classic Turret press with inexpensive Lee dies. Maybe I could wring another 1/4 MOA out of it by improving the press, the dies, the components, etc., but why bother? The turret is fast and convenient and it makes "accurate enough" ammo for me.