260- I forgot to add in the other post. If the necks are square on the 308's then it's in how you're necking up. In my Whelen I used an RCBS tapered expander and didn't take my time . Rotating the case during the neck up procedure may help too. Use a good lube, back in the day I used Red Rooster forming lube. Again if they were square to start with, they'll be square when fire formed.
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