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barry206,

.004 clearance is cutting it a little close. A little different radius on the outside of the gauge or case mouth could make that much difference. If there was an even slightly measurable benefit, it might be worth the effort to keep it that close. However, it would take a world class benchrest setup to measure the difference in .040 case length when they are all the same. Even then, it would take many, many groups, fired under controlled conditions to see any difference. We are talking an underground range here. You will never measure the difference shooting outdoors.


Using the time to practice will give 'orders of magnitude' more benefit than exact case length.


Jack


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