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As I recall when the scale of the late Jack O Conner was checked, the scale was off by about three grains.
O'Conner was the guru of the Winchester 270 as being the greatest all around cartridge ever.
BUT when you are loading cartridges in the 60,000 to 65,000psi range and original factory was 50-55 thousand psi, your performance will be better.
Thats why we check scales against known weights sets. And pocket change is not calibration weights.
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