Hi,
My mold, a Lee 124 LRN tumble lube design, drops bullets at .357"-.358" using wheelweights. They shoot fine in my CZ, and don't cause any particular leading problem.
However, I size 'em to .356" to eliminate the "bulges" I have gotten in certain cases. Reason being if those cases are finished thru the Lee Factory Crimp Die, there's never been a feeding problem, but before I started using the FCD, I did have a couple of failures. So it's a "belt and suspenders" thing I suppose.
Plus lumpy ammo looks bad, and if it was supposed to be lumpy, the factory would have made it that way, right? ;)
Rick C