Why is chambering freely the goal? An inability to close the bolt would be something to avoid, but what is it about smooth cycling that indicates a better fit than a little resistance? I can see how sizing 1 to 2 thou under the dimension of a once-fired case could be needlessly sizing the case down, and the bolt close method would disclose whether the case really needs to be sized down that much or not. Bumping a fired case seems less and less likely to size the case down excessively on subsequent firings. Even so, I can see how the bolt-close method could be used without the necessity of more firings and that it demonstrates a more direct feedback.