300 Norma Improved

Discussion in 'Big Stuff -- 6.5mm, 7mm, 30 Cal' started by rpierce, Sep 10, 2018.

  1. bigngreen


    Jun 3, 2010
    I've seen two RUMs that set back the lugs, one in a Defiance and one in a Rem. they have less bolt thrust and untill recently with ADG the brass quality wasn't up to holding the pressures of the Lapua so you'd run lower pressure than a Lapua would show.
    Kirby Allen has probably done some of the more agressive wildcatting with the Lapua and he does unitial pressure work with Norma brass so the pressures show then once he has his pressures figured out switches to Lapua brass which definitely would keep things under the red line.
    rfurman24 likes this.
  2. slugger3


    Feb 8, 2015
    Ok, so are ALL actions suseptible to bolt set back, (custom and factory) especially if they are subjected to loads like the 300 RUM shooting 90 to 100 grains of powder?

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