I vote Dillon 550. I've never owned a Hornady. They may be nice. I had a Loadmaster for 6yrs. No way in hell you could give me one again. It made nice ammo but needed tinkering constantly. All three brands seem to have very good customer service.
I had abandoned priming on Loadmaster cuz it was constant problems. Priming system on Dillon is far superior.
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