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New Vs once fired brass

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  • November 27, 2022 at 11:37 am #462760
    Dennis Filipowski
    Participant

    Just today I came across a confusing and frustrating situation.

    I bought some of the new 9mm brass from RMR. Have been loading and they ran very consistently.

    Today I wanted to compare the results using the once fired I have was using prior.

    All looked good until I checked the COLA. The once fired brass length was 020-.025″ less.
    Did several rounds with used brass. All much shorter.
    Grabbed several new brass cases and they were perfect at the COLA I set previously for the 9MM.

    Why would new vs used brass run so different?

    9MM 124 gr MW bullets

    November 27, 2022 at 6:48 pm #462853
    SC
    Participant

    As long as it within SAAMI spec, why worry about it?

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