Are you potentially chasing your own tail when it comes to neck concentricity?
I am always keen to develop and test new methods of load development. Anything I can do to speed up the process of finding optimal loads - it means less component use and more time to practise my shooting and confirm ballistics and less testing loads.
The new generation of VLD (very low drag) projectiles have brought with them more accuracy, and more requirements to optimise. It won't be new to shooters that bullets have a sweet spot when it comes to seating depth. For a long time F-Class and BR shooters have been 'jamming the lands' - setting seating depth out long enough where the bearing surface is actually touching (or even slightly pushed into) the throat of the rifling. Minimising jump eeks out the final bit of performance.