The Hornady Lock-N-Load® Modified Case .222 Remington (Manufacturer Part Number: A222 / 05456) is a precision handloading measuring accessory designed to find the exact distance from a rifle chamber's rifling lands to the bullet ogive. Manufactured from standard factory brass to SAAMI cartridge dimensions, this modified case features a threaded case head that attaches directly to the pushrod of a Hornady Lock-N-Load O.A.L. Gauge (Straight model #C1000 or Curved model #C1550). The case neck is factory-expanded by .002 in (.051 mm), enabling handloaders to slide production .224-inch projectiles in and out without binding to establish precise zero-jump reference points.

Key Features

• Threaded Base Interface: Screws directly onto Hornady O.A.L. gauge pushrods to keep the case centered and squarely aligned in the firearm chamber during measurement.
• Expanded Case Neck: Widened by .002 in (.051 mm) to hold standard .224" diameter bullets with light friction, allowing smooth pushrod engagement without altering the bullet profile.
• Bench-Level Measurement Repeatability: Allows reloaders to measure freebore travel and seating depth down to 0.001 in (0.025 mm) increments when paired with comparators and calipers.
• SAAMI-Spec Production: Formed to standard .222 Remington factory tolerances to ensure proper fit inside production rifle chambers.

Specifications

• Brand: Hornady
• Model / Item Number: A222 (05456)
• Calibre: .222 Remington
• Material: Factory-modified brass casing
• Neck Expansion: .002 in (.051 mm) over standard neck dimension
• Measuring Precision: Within 0.001 in (0.025 mm) when used with calibrated measurement tools
• Tool Compatibility: Hornady Lock-N-Load O.A.L. Gauge (Straight #C1000 and Curved #C1550)
• Operational Status: Non-firing measuring tool; non-powered mechanical accessory

Who is the Hornady Lock-N-Load Modified Case .222 Remington for?

• Precision handloaders tuning seating depth for .222 Remington benchrest rifles — Requires measuring chamber clearance to 0.001 in precision, utilizing this reloading case length gauge to establish exact jump-to-lands dimensions for tight match groupings.
• Varmint hunters developing custom load accuracy in .222 Remington platforms — Relies on the .002 in oversized neck expansion of this modified case to seat specific field projectiles smoothly and map chamber wear over extended shooting strings.

Less suitable for: Firearm chambers cut for .222 Remington Magnum, .223 Remington, or .221 Rem Fireball, which require their respective calibre-specific modified cases, or handloaders looking for live ammunition components, as this non-firing tool has a threaded primer pocket and cannot accept powder or primers.