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Unclenick, I "SAAMI twisted" all rounds used for velocity tests. Both with .308 Win and .30-.338 Win Mag. They were loaded with reasonable repeatability but with about 95% to 97% charge density for each, some powder position irregularities could cause that much change.
More interesting was with the 12 pound .308 shot slung up in prone as well as standing without a sling, muzzle velocities from prone were higher than standing by about 15 fps. Again, with the same loading techniques; rifle held level all the time.
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