Thread: Redding S Type Match Dies - Bushing or not?

You cannot neck size without a bushing. Type-S need one or its just a huge hole. I suspect you have loaded your old tight neck brass and have minimal neck tension now.
If your chamber was tight, then opened up, the bushing you had will still give the same neck tension if you're using the same brass. The variable changed was the chamber not the components.
Do you know how to measure neck tension? Try that first and should point you in the right direction.