212 ELD-X 300 Win Mag Powder Crunch

3.472 OAL ,new Hornady brass , not sure of the case capacity, velocity for new brass 2930 fps 73.8 gr h1000 220 gr ELDX , once fired brass velocity 1868 fps 24 in barrel 1 in 10 twist , thanks for your help
 
depriming and setting neck tension with the collet die on once fired brass , neck sizing new brass ,then priming loading etc
 
I would scratch the collet. Just resize and then the seater die. Use a bushing die. I remove all stems from my dies, they just add wear on the brass , unless you have links and dents to straighten out.

Have you tried that and seen what your accuracy is doing?

Seems like a neck tension issue and a case capacity change. Thus the extreme difference in accuracy and velocity
 
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