The Forster Co-Ax sizes and seats more concentric than my screw in and lock down die presses. It does it without any effort. However with good techniques fixed die presses are fully capable of loading concentric ammo. Sometimes though it does take some fiddling to get good alignment with dies and shellholders. I'd choose the Co-Ax for the natural tendency to seat and size for low run-out. Most say 0-2 thousandths for match ammo and 0-4 thousandths for hunting type ammo is sufficient.
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