[44 AMP]

If you get the neck tension "right" you do not get setback, even with repeated chamberings.

But to get it right, you need the correct relationship between the bullet diameter, and inside neck diameter (actual, not nominal) when the bullet is seated.

Actual diameter of the bullet
Actual diameter of the case

Not what it should be/is listed as, but what it really is

I'm surprised that no one mentioned checking the diameter of your expander.

You mentioned checking it for how much flare it is giving the case mouth, and that a point as well, but the diameter of the lower part of the expander (which does the actual expansion of the case to hold the bullet after rezising) is important, too.

ALSO, what is the right combination of factors for a good tight fit can change with a different brand (or even lot#) of case, or bullet. And this assumes that all the cases or bullets in the batch you have are consistently the same actual size.

Everything made, even things made to a specific size (such as .355" diameter) may vary slightly from the listed spec. They can do this and still be within "standard" tolerances, or they might be outside the acceptable range, and still be in your hands to use, anyway.