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  1. J

    300 Norma Mag - Overpressure Signs Due to New Norma Brass???

    Gunsmith got back to me. Peterson brass is .016 short and has the incorrect shoulder angle. Now I need to find a load for some cheep pills to fireform my brass. Any suggestions?
  2. J

    300 Norma Mag - Overpressure Signs Due to New Norma Brass???

    I contacted the smith and told them about the issue. I've sent the fired case to them as they are not local for their inspection.
  3. J

    300 Norma Mag - Overpressure Signs Due to New Norma Brass???

    Note the ejector post mark on 'Magnum' and extractor recess mark over 'Peterson'.
  4. J

    300 Norma Mag - Overpressure Signs Due to New Norma Brass???

    It's a head space issue. Fired case is 0.020" longer at the shoulder. Looks like the shoulder angle has sharpened too!
  5. J

    300 Norma Mag - Overpressure Signs Due to New Norma Brass???

    I'll get back to you with that information in the next few days as I'm not near the rifle at the moment. I'm hoping there is no massive difference! Rifle has only just been assembled. I'm not sure if it is related, but subsequent chambered rounds have rub marks on the bearing surface on the...
  6. J

    300 Norma Mag - Overpressure Signs Due to New Norma Brass???

    I'd have thought. 020" would be an adequate amount of jump. The bullets seemed to feel the same as other cartridges I've loaded for, perhaps a little tighter, ill do some mesuring... The primer remained intact, just a little flat. I'd have expected to get a much higher velocity seeing as the...
  7. J

    300 Norma Mag - Overpressure Signs Due to New Norma Brass???

    @mtwalsh367 Did you come up with a reason for the pressure signs? Under minimum load? I've just had the same issue with 83 gr Retumbo, Federal 215 primers, 230gr Berger VLD .020" off the lands. I used Peterson brass. Fired one shot at 2808fps and have clearly visible marks from both the ejector...
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