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3003 3006

n/an/a Member Posts: 168,427 ✭
edited October 2009 in Ask the Experts
What is the difference in these rounds other than the 06 was developed for spitzer bullets?

Sage 1
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  • AmbroseAmbrose Member Posts: 3,187 ✭✭✭✭
    edited November -1
    The '03 has a longer neck. Cannot be used in an '06 chamber. However you can use an '06 in an '03 chamber.
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  • Tailgunner1954Tailgunner1954 Member Posts: 7,734 ✭✭
    edited November -1
    30-03 (7.62x64mm) was designed to use a 220gr RN bullet (same one used in the 30-40 Krag).
    30-06 (7.62x63mm) was designed to use a 150gr Spitzer bullet.
    Other than the neck length (the longer neck wasn't needed with the shorter bullet) the 2 cases are identical.

    When they converted the origional 1903 Springfields, they simply set the barrels back 1 turn and recut the chamber, leaving themselves with the correct clearance for the shorter neck and shortening the throat slightly.

    I went through that rather long winded thing, so that you would understand why you can safely use the later round in the earlier chamber.
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  • givettegivette Member Posts: 10,886 ✭
    edited November -1
    Anybody know if there was (is?) a difference in rifling rate-of-twist? Thanks, Joe
    EDIT
    Tailgunner: thanks for the response, below. Best, Joe
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  • Tailgunner1954Tailgunner1954 Member Posts: 7,734 ✭✭
    edited November -1
    Joe
    Just like the Krag before them, they both used a 1-10 twist rate.
    IIRC the first US 30 cal to use a different twist was the M-14
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