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As you probably already know the trend is to " full length resize " for best accuracy . What is left out of this statement is the " minimal " part of the fl resize . The Redding body dies should not size as fully a s say for instance RCBS fl dies .
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I found that rifle chambers at the small end of SAAMI specs end up with fired cases full-length sizing well in RCBS dies. Factory chambers are often on the large end of SAAMI specs and some dies may reduce body diameters too much and case life is short. Full-length sizing needs to reduce body diameters only about .003-inch.
For H&H belted cases, one other die that typically makes full-length sized cases shoot more accurate is one that will size the body all the way back to the belt. This eliminates that step in front of the belt virtually all full-length sizing dies make which interferes with the step in the chamber the belt headspaces against. There's only .003-inch difference between GO and NO-GO tolerances on the H&H belt. See this die at: