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Old May 5, 2013, 04:26 PM   #15
603Country
Senior Member
 
Join Date: January 6, 2011
Location: Thornton, Texas
Posts: 2,199
I'm with Bart B on this, though I won't say it the same way. With a case like this that doesn't have a lot of body taper, if you don't size the case enough, the shoulder will move forward and won't be set back enough - or set back at all. This isn't a problem usually with cases with more taper, like 270 or 220 cases. I think that the OP needs to not size less, but actually size a bit more, and set the die as RCBS instructions say. Of course, the objective is to set the shoulder back just enough and not too much, and sometimes the RCBS instructions will push the shoulder back too far, leading to case life problems. So, Brian's suggestion about using the proper gear to be able to determine the proper setback and arrange the die for that, is the way to go.
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