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Lugerstew, I load .308 brass for a friend who has both 7.62 and .308 brass. i sort and reduce the load in the 7.62 by 1/2 grain. I have shot this a lot over the chrono and find an average difference in velocity of only 10 fps. these are 10 shot groups. I sort my own ammo by head stamp and weight to within 1 grain. Does it make a difference, I have the time.
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