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Use an o ring to hold the case against the bolt headfor the first firing. Neck size from that point on. I shoot 220 grain cast at 1800fps and don't size the neck at all. Most 303 have a .314 bore or bigger and using a 308 projectile will not be accurate.
Get the headspace checked if an O ring will let the bolt close you have a headspace problem, .303's headspace on the rim not the shoulder
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