The Hornady Primer Pocket Uniformer Large (MPN: 041211) is a mechanical brass preparation cutter engineered to machine primer pockets to a consistent depth while squaring the internal corners. Designed for precision cartridge reloading, this tool establishes uniform primer seating depths across brass lots to ensure consistent ignition. It features an integrated depth-stop shoulder collar that bottoms out on the case head to prevent over-cutting or thinning the brass. Operating as an unpowered cutting accessory weighing under 50 grams, it integrates standard 8-32 male threading for mounting into compatible powered prep centers, case preparation stations, or manual handles.

Key Features

• Precise Pocket Depth: Cuts standard large primer pockets to a squared, uniform bottom surface to standardise primer seating depth and shot-to-shot ignition consistency.
• Integrated Shoulder Stop: Features an engineered depth collar that rests against the cartridge case head, mechanically stopping the cutter to prevent thinning the base web.
• Universal 8-32 Thread: Equipped with standard 8-32 male threads for direct compatibility with motorized prep centres, power tool stations, or threaded handheld accessory handles.
• Carbon Buildup Removal: Cleans out stubborn combustion debris and hardened carbon from the bottom edges of fired pockets prior to repriming.

Product Specifications

• Manufacturer Part Number (MPN): 041211
• Pocket Size Compatibility: Large Rifle and Large Pistol pockets (~0.210″ diameter)
• Thread Interface: Standard 8-32 thread
• Tool Weight: Under 50 grams
• Tool Type: Passive mechanical cutting bit (requires no electrical power input)
• Tool Interface Compatibility: Hornady Lock-N-Load Case Prep Center, Hornady Case Prep Trio, and prep tools with 8-32 female receiver threads

Who is the Hornady Primer Pocket Uniformer Large for?

• Precision rifle handloaders — Requiring uniform primer pocket depth across large rifle brass like .308 Win and .30-06, this large primer pocket uniformer squares internal pocket floors with an exact cutter diameter calibrated for standard ~0.210″ diameter pockets to maintain consistent firing-pin strikes.
• Competitive shooters — Seeking to eliminate manufacturing dimensional discrepancies in large-calibre brass cases, using standard 8-32 thread tooling that adapts into multi-head motorized case preparation centers to batch-process brass to identical seating depths.

Less suitable for: Small Rifle or Small Pistol cartridges with ~0.175″ diameter pockets, which require a dedicated small pocket uniformer, or military brass bearing staked or ring crimps, which require a dedicated primer pocket swager or chamfering reamer tool before a uniformer can seat properly.