Brass bushing issue.

[rhovee]

So i have a 6.5WSM and am necking down 270wsm brass with a Redding FL die using a .294 bushing. I have done this for months. I purchased 150 pieces of brass all same lot. The only thing i have changed in the last few months was getting rid of the expander ball. Tonight i did my normal routine and decided to check the OD on the sized brass. It was .290. How can brass neck down smaller than the bushing? I questioned somehow there was thicker brass in this box that others. But my thinking would be that even if it was thicker, the OD would still remain the same. If i put the expander ball back on it irons out. I inspected and cleaned the bushing. It's the Nitrided bushing so it didn't have any junk on it. I do dip the necks in powder graphite to ease the process.....

 

[dkhunt14]

Did you use a Mic to measure? A caliper can easily be off .001 or .002. The bushing could be off .001. Matt

 

[rhovee]

I checked the calipers and they are working correctly. I even took a fired piece of brass and sized it and it came out .294. Not sure how virgin brass of the same lot can be that far off.

 

[L.Sherm]

Anneal the brass and try again this time with the expander, stranger things have happened.

 

[rhovee]

I think I figured it out. Somehow the bushing was being stuck and not floating cause the edges to overlap.

 

[243winxb]

How can brass neck down smaller than the bushing?

Redding has the answer on their web site.

Quick answer- sizing down more than .008" in one step can do it.