Well, I got a .430 sizer instead, and sized some, and I just seated the gas checks on the unsized .432 bullets and fired off a set of each. I couldn't tell any difference in accuracy, both shot about the same. This was only tried with 10 of each with a loaded with Unique, so probably not a definitive test. Maybe if someone who could actually shoot tried the same thing it might be.
But, being lazy like I am, I'm just going to use the .430's until I run across another couple of sizers....431 and 432, then I might do some exhaustive testing. However, I exhaust pretty quick.....