Jud96, I shoot Nosler 221 brass in my 221FB. Will form a 20VT from the Nosler 221 brass, seat a flat base bullet, and let you know the loaded neck diameter tomorrow morning. I am curious myself as I have a .232nk 20VT barrel for a switch barrel and I have not shot the 20VT barrel yet. Shooting the 221FB barrel.
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John
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