Why not buy a 6.5x55 and have it AI'ed the 6.5x284 seating die will work and the size die will probably be ok for neck sizing 6.5x 55 brass is way cheaper than the 6.5x284 the case capacity is pretty much the same quite a few F class shooters had them built back in the early days of F class could not tell the difference in performance at 1000 yds
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