Some seating dies,like Hornady are not case specific.I have both, 243 RCBS 3 die set (incl neck),and a Redding,bump shoulder,neck bushing,plus body die for my 243AI.I seat bulets with a Vickerman seater and have the 23 and 40 deg shoulder inserts for the die.There may be issues seating the Ackley in a seater other than the 6mm Hornady,or one set up like my vickerman.
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