What specific cartridge cases are supported by the Hornady #4 Trimmer Pilot?

The Hornady 390946 #4 pilot features a .257-inch diameter specifically designed to guide and center cases such as the .25-06 Remington, .257 Roberts, .257 Weatherby Magnum, .250 Savage, and .25-35 Winchester during the trimming process.

Is this trimmer pilot compatible with case trimmers from other brands like RCBS or Lyman?

No, this pilot is designed specifically for use with the Hornady Cam-Lock Case Trimmer and original Hornady legacy manual case trimmers. It mounts directly onto the cutter head using the standard set-screw mechanism and is not guaranteed to fit competitor cutter shafts.

Does the Hornady 390946 pilot require any electrical power or special setup tools?

No electrical power is required since this is a completely mechanical, unpowered reloading accessory. Installation simply involves sliding the precision-machined steel pilot into the front of the cutter spindle and securing it tightly with a single set-screw.

Can I use the #4 pilot for trimming smaller calibres like .224 or 6mm?

No, using this .257-inch pilot on smaller calibres such as .224 or 6mm will prevent it from fitting into the case mouth. You must use caliber-specific pilots, such as the Pilot #3 for 6mm, to ensure proper alignment and prevent damage to your brass.

Case Trimmer Pilot - Hornady 390946

The Hornady Case Trimmer Pilot #4 (.257 Caliber) (MPN: 390946) is a precision-machined steel reloading accessory designed to maintain case mouth squareness during brass preparation. Engineered for use with manual Hornady case trimmers, it inserts directly into the cutter spindle to guide and align the interior case neck concentric to the cutter head. This prevents off-axis cutting and ensures uniform overall case lengths across batches of fired .25-calibre rifle brass.

Key Features

Concentric Alignment: Centers the cartridge case mouth directly in line with the trimmer cutter head to produce square, flat, and uniform case mouths.
Precision-Machined Steel Construction: Built from durable machined steel to resist wear and maintain strict dimensional tolerances through repetitive handloading cycles.
Simple Set-Screw Mounting: Slides directly into the cutter spindle of compatible trimmers and secures rapidly via a single set-screw.
Dedicated .25-Calibre Support: Specifically dimensioned for standard .257-inch internal neck diameters, preventing case wobble or binding during the trimming stroke.

Specifications

Brand: Hornady
Model Number (MPN): 390946
Pilot Number: #4
Pilot Calibre / Diameter: .257 inch
Material: Machined steel
Power Requirements: None (manual mechanical tool)
Trimmer Compatibility: Hornady Cam-Lock Case Trimmer (Item #050140) and legacy Hornady manual case trimmers
Cartridge Case Compatibility: .25-06 Remington, .257 Roberts, .257 Weatherby Magnum, .250 Savage (.250-3000), .25-35 Winchester, .25-20 Winchester, .256 Winchester, and .25 WSSM

Who is the Hornady Cam-Lock Case Trimmer Pilot #4 (.257 Caliber) for?

Handloaders reloading .25-06 Remington and .257 Roberts ammunition for medium game hunting — requires a dedicated .257-inch diameter case trimmer pilot to keep brass mouths perfectly square and consistent across repeated firings.
Handloaders preparing .250 Savage and .257 Weatherby Magnum brass cases for precision shooting — utilizes the exact .257-inch diameter spindle to eliminate internal neck play and maintain precise concentricity during case length trimming.

Less suitable for: Cartridge brass with internal neck diameters smaller than .257 inch (such as .224 inch or 6mm) or larger than .257 inch (such as 6.5mm or 7mm), which require calibre-matched trimmer pilots (such as Pilot #3 or Pilot #5), as well as non-Hornady trimmer platforms with non-standard cutter spindle mountings.

SKU	HN102885LP
Model #	390946
Brand	Hornady
Shipping Weight	0.1000kg

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Hornady 390946 Case Trimmer Pilot .257 Caliber Reloading Accessory

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