I once compared RCBS against Lee while loading .223 and 7mm Rem Mag.

Setup was as follows.

RCBS Rock Chucker and FL die sets as well as RCBS shell holders.

Lee Classic Press and FL dies sets and shell holders.

I took 10 pieces of fired brass of each caliber and FL sized 5 of each with each press. I then seated the same bullet for each caliber using the separate presses to the same depth. Afterwards I checked bullet runout and found that both presses were identical to eachother.

For half the bucks of the RCBS I still had RCBS quality ammo.