Thread: Neck tension

Originally Posted by tui_man2

Bushing dies

Measure loaded dummy round neck diameter
Use correct bushing .002 smaller

Job done

Abe, the problem with that is that the OD of a loaded round may or may not have any relation to the chamber.

Shoulder bump, you're looking at a fire formed case, and sizing relative to that... With a fixed diameter projectile, but variable neck thickness and variable chamber dimensions it all gets a bit random. If you are using a high-end barrel, and can specify how tight you want the neck in terms of the reamer, then turning the necks, and using a known size bushing makes sense.

Also, .002 bushing on very thin brass won't give you the same tension as on thick necks. So to get consistent tension, you pretty much have to turn the necks, which can cause a whole other set of problems with an average "loose" neck chamber...