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11 mar 2021 · Cartridges with +P Pressures, list both the standard and +P Pressure. The trim to length is equivalent to the minimum case length. COAL stands for Cartridge Overall Length, and is the measurement from case head to bullet tip. The source of this information is the SAAMI Manuel. Last Updated 3-11-2021.
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Revisions to existing SAAMI Accepted Cartridge and Chamber Drawings. Occasionally a dimensional correction may be made to an existing cartridge/chamber design. In those cases the revision will initially be posted in this section until such time as the drawing is updated in the SAAMI Standards.
ened compared to the .308 Winchester. The shorter case dimensions would enable long high-BC bullets to be used if necked down to 6.5mm, and that’s essentially what Hornady did to create the 6.5 Creedmoor case design. TRIAL AND ERROR. Once the basic formula was solved for the 6.5 Creedmoor cartridge design, it was a matter
6 wrz 2023 · The following chart shows the usable interior case volume of all popular rifle cartridges, measured in cubic inches and assuming a standard .013″ brass thickness. By “usable case capacity,” I mean the internal area of the body of the case and shoulder, but none of the neck.
The 6.5mm Creedmoor was designed for target shooting at longer ranges, and as such, couples a sensible case volume (3.40 ml) to bore area (34.66 mm 2 /0.3466 cm 2) ratio with ample space for loading long slender projectiles providing good aerodynamic efficiency and external ballistic performance for the projectile diameter. [4]
4 sie 2024 · The .308 Winchester has a slightly longer same case length (1.92″ vs 2.015″), but the 6.5 Creedmoor has a little bit longer overall length (2.825″ vs 2.81″). The 6.5 Creedmoor has a sharper shoulder angle (30 degrees vs 20 degrees for the 308) and a slightly less tapered case than the .308.
The specifications for 6.5 Creedmoor and 308 Winchester state the case capacity at 52.5 gr and 53.5 gr, respectively. This means that the powder charge for both cartridges will be similar. This large of a powder charge in a smaller diameter barrel will mean that the 6.5 Creedmoor will wear out a barrel considerably faster.
