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...

Originally Posted by veitnamcam

Also 2 thou on say a 17 cal would be a lot compared to say 2 thou on a 50 Cal yes?

I don't load stuff that small or big so I don't care

Originally Posted by ebf

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...

All my brass is neck turned to .013 so again .002 works mint for me. Use no expanding balls just size them with correct bush.

I have .005 clearance on my loaded rounds so .0025 each side clearance, all mine are hunting guns in have no need to go super tight neck

Tried less and they move still. Try more and what's the point is holding them so tight.




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