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If you can hang on to the chrony for another session I would try a box of factory ammunition and compare results with your handloads, you've already stated your rifle has a 24' barrel, the results in your loadbook may have been developed in a 26" barrel.. FWIW the original factory loading developed for the 7mm Remington Mag was an non canister lot of IMR7828, I used the same powder (canister lot) for my 7MM Remington Mag that produced excellent accuracy but have no idea of the velocity developed. William
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