Wanted: .280 .280ai brass

Expand up .270 brass or f/l size 30-06 brass and fireform?
I do the former, use a .30 cal sizing button to neck up to .30 and then neck back down to .284 leaving a false shoulder to head space, load with 150 gr soft point and away you go. Anneal at each stage, makes perfectly good .280 brass, it’s just 20 thou short.

The fire forming load is 3/4” at 100 and I was ringing steels out to 600 quite happily with it too .
 
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