@Trout I am presuming it was factory ammo? Do you still have the brass...? The reason I ask is that the only time I have seen a wander like this (and at 100 yards) when we checked the rest of the ammo we found a diffference in the headstamp...The box and 17 of the rounds were headstamped 30/06 and three (one still unfired) were marked .270........... We suspect that these were from an unsealed pack new from the shop where somone had been comparing and NOT pu tthe correct rounds in the correct packet. The implication being there was a pack of 270 in the shop that had 3x 30/06 rounds in it....
While this is unlikely in your case, it is, however a slight possibility and could be worth checking....even if it is to simply reassure yourself that nothing untoward has happened....
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