With your flat based bullets its a good idea to at least neck size your brass, if not F/L. Brass (even Lapua) gets knocked around in shipping and handling. Case necks become oval shaped, mouths deformed, dented etc. Kinda difficult to push a round bullet into a oval shaped case mouth. In addition, out of the box Lapua brass will have a noticeably smaller neck diameter when compared to sized brass again making it difficult to seat bullets without 1st re-sizing. Pistol bullets, also flat based, are loaded into flared case mouths. You can benefit by paying careful attention to your chamfering step when loading flat based bullets.
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