I run a 300 RSAUM. Loaded 5 dummy rounds of both Nosler and Norma. The Norma had lumps on the necks. Wasn't much of a lump but you could measure it with 0-1 mics. No size difference on the necks of the Nosler brass. Ran the Nosler brass. Have 9 to 10 reloads with no problems on the Nosler.