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Manufacturers Hornady

Hornady OAL Modified Case 257 ROB #A257R

$20.00 incl GST

Hornady Reloading Components & Accessories: Provide Consistency and Precision

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10060

Hornady, Accessories

Specifications

brand: hornady
accessories: OAL Modified Case

Description

Hornady OAL Modified Case 257 ROB #A257R

Seating depth regulation, as well as the resulting "jump" to the rifling, is often recognized as critical to increased accuracy. The difference between ordinary accuracy and true tack-driver performance can be measured in thousandths of an inch between the bullet and the rifling. 

Features:

⁍Modified cases for use with Precision Gauges
⁍Uses fine thread to keep case square for precise chamber alignment
⁍Rounds neck of case and opens to allow a standard diameter bullet to slip into case mouth

Additional Information:

Brand: Hornady
Caliber: 257 Roberts
Ammunition Type:  Rifle
MPN: A257R
 

Best Suited For

  • Precision reloaders working with .257 Roberts rifles
  • Shooters optimizing bullet seating depth for accuracy
  • Load development for hunting or long-range shooting
  • Users of the Hornady Lock-N-Load OAL Gauge system
  • Anyone seeking consistent and repeatable COAL measurements

When To Use It

  • During load development to find optimal bullet jump to lands
  • When tuning loads for maximum accuracy and consistency
  • After changing bullet type, weight, or profile
  • When setting up a new rifle or verifying chamber dimensions
  • For precision handloading workflows

Technical Information

  • Product Code: A257R
  • Calibre: .257 Roberts
  • Material: Brass
  • Compatibility:
    • Hornady Lock-N-Load Overall Length Gauge (straight or curved models)
  • Design Features:
    • Threaded base replaces primer pocket for gauge attachment
    • Expanded/rounded neck allows bullet to slide freely and concentrically
    • Maintains square alignment in chamber for accurate readings
  • Function:
    • Measures distance from case head to bullet ogive relative to rifling
  • Weight: Approx. 0.03 kg

FAQs

Q: What does an OAL modified case actually measure?
A: It helps determine the maximum seating depth where the bullet contacts the rifling (lands), a key factor in precision reloading.

Q: Do I fire or reload this case?
A: No. It is not for firing—it is strictly a measuring tool.

Q: Do I need one for each calibre?
A: Yes, each cartridge requires its own specific modified case for accurate chamber fit.

Q: Can I make my own modified case?
A: It’s possible, but factory Hornady cases are precision-machined for better consistency and ease of use.

Q: Will it work without the Hornady OAL Gauge?
A: No, it is designed specifically to thread into and work with the Hornady gauge system.

Delivery and Compliance

  • Classified as a reloading tool component (non-controlled)
  • No firearms licence required
  • No shipping restrictions
  • Safe for standard courier delivery

Questions?

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