Chuck,
I just got curious about the size that various Lee Sizing Dies do actually size cast bullets. So here are what my Lee Dies do:
.284 sizer0.2845
.309 sizer0.3093
.358 sizer0.3575
.430 sizer0.4298
So, I guess it depends on whether the Lee Die will size larger or smaller than specified size. Regardless, they do work quite well. Although I generally just size the check in place with my RCBS Lube-O-Matic, and shoot the bullet as cast. I do have a couple of loads that I do fully size the bullet (plain base bullets mostly). These are generally for straight-wall handgun bullets at moderate velocities. And, I size the bullets before lubing them. I have never had any problems with not using lubed bullets as indicated in the instructions. These are bullets cast from wheel weights or alloys less than than BHN 8.5. Heat treated bullets are a different story!!! Good-luck with your sabot project
BCB