The one I generally recommend for a first-timer is the RCBS Casemaster, since it also measures neck thickness, a critical component in several aspects of accuracy, including sizing cases straightly.

Also have a Sinclair and a NECO. The Sinclair is smoother than the RCBS, but doesn't measure any more accurately. The NECO measures neck (and case-body) thickness as well, but is slower to use. Which is why my Casemaster still gets more use than the others.

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