The Hornady Vernier Ball Micrometer (Model 050059) is a specialised mechanical measuring instrument designed for precision handloaders and benchrest reloaders. Engineered specifically to measure curved cartridge brass, it evaluates case neck wall thickness, variation, and neck uniformity to minimise bullet runout. The tool pairs a spherical ball anvil with a tapered spindle on a steel C-frame finished in baked enamel. Featuring an analog vernier scale on the sleeve and thimble, it operates entirely mechanically without the need for batteries or electrical power.

Key Features

• Spherical Ball Anvil: Features a rounded contact anvil that seats securely against the inside curve of cartridge case mouths to measure wall thickness without distorting the interior radius.
• Tapered Spindle Tip: Chamfered at the contact point to permit clear access and true measurements flush against cartridge case shoulders.
• Friction Ratchet Stop: Incorporates a mechanical ratchet mechanism on the thimble to deliver uniform, repeatable measuring pressure across multiple brass samples.
• Integrated Spindle Lock: Mechanical lock lever preserves spindle position to retain measurements when sliding cases off the anvil.
• Standard Bench Accessories: Ships with a dedicated zero-adjustment spanner wrench and a fitted plastic protective storage case.

Product Specifications

• Measurement Range: 0 to 1.0000 in
• Resolution / Accuracy: 0.0001 in
• Scale Type: Vernier mechanical scale
• Frame Construction: Steel C-frame with baked-enamel finish
• Packaged Weight: Approximately 0.85 to 0.86 lb (385 to 390 g)
• Package Dimensions: 7.65 to 7.75 in L × 1.75 in H × 7.75 to 8.60 in W
• Power Requirements: None (manual analog tool)

Who is the Hornady Vernier Ball Micrometer for?

• Precision handloaders — requires accurate readings down to 0.0001 in across a 0 to 1.0000 in range to detect wall thickness variations and sort brass lots by consistency using this vernier ball case micrometer.
• Benchrest reloaders — relies on the 0.0001 in resolution to monitor brass neck-turning cuts and verify uniform clearance before chambering, making this vernier ball micrometer essential for eliminating neck-tension runout.

Less suitable for: Sub-calibre cartridge cases where the mouth diameter is smaller than the ball anvil, or for measuring the outside diameter of round objects such as bullet profiles; convex surfaces require a standard flat-anvil micrometer or dial caliper instead.