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Hornady OAL Modified Case 7mm SAUM B7MMR

To function with Lock-N-Load Precision gauges, these casings have been specially adapted. They are attached to the gauges using a specific, thin thread, which guarantees that they stay square so they may be precisely aligned in the chamber of your gun. To provide the most accurate outcomes possible, the case's neck is secondarily designed to be completely spherical and opened just enough to let a bullet of standard diameter slide into the case mouth with ease.

Best Suited For

  • Reloaders using 7mm Remington SAUM (Short Action Ultra Magnum)
  • Long-range and precision shooters
  • Hunters optimizing seating depth for performance
  • Users of Hornady Lock-N-Load OAL Gauges (straight or curved)

When To Use It

  • During load development to determine optimal seating depth
  • When changing:
    • Bullet type or ogive profile
    • Powder charge
    • Rifle or barrel
  • To measure bullet jump to lands for accuracy tuning
  • Before setting seating dies for consistent ammunition

Technical Information

  • Model: B7MMR
  • Caliber: 7mm Remington SAUM
  • Series: “B” Modified Case lineup
  • Material: Brass (manufactured to SAAMI specs)
  • Compatibility: Hornady Lock-N-Load OAL Gauge
  • Threading: Precision-threaded case head
  • Neck Design: ~0.002" oversized for slip-fit bullet insertion
  • Accuracy: Typically ~0.001" repeatability
  • Weight: Approx. 0.032 kg
  • Origin: Made in USA
  • Usage: Measurement tool only (not for firing)

FAQs

Q: Can this modified case be fired?
No. It is strictly a measuring tool and must never be used as live ammunition.

Q: Will it work in all 7mm SAUM rifles?
Yes for standard chambers. Slight chamber variations will result in slightly different measurements—this is normal.

Q: Does it work in tight-neck chambers?
Not always. Modified cases may not function properly in tight-neck chambers.

Q: What tools are required to use it?

  • Hornady OAL Gauge
  • Calipers (preferably with a bullet comparator)

Q: Why use a factory modified case instead of DIY?
Factory cases provide better alignment, smoother bullet fit, and more consistent results than drilled/tapped cases.

Delivery & Compliance

  • Classified as a non-controlled reloading accessory
  • No firearms licence required to purchase
  • Generally permitted for import and courier delivery
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