Is the Hornady Shell Plate 12 Ga (Model 390129) compatible with my Hornady Lock-N-Load AP metallic reloading press?

No, this shell plate is exclusively engineered for Hornady 366 Auto progressive shotshell reloaders and will not fit Hornady Lock-N-Load AP metallic presses. Metallic L-N-L AP presses use a completely different numbering scheme, whereas model 390129 is strictly designed as a rotating carrier plate for 12-gauge shotshell hulls.

Can I use this 12-gauge shell plate to reload other gauges like 20 ga or .410 bore on my 366 Auto press?

No, the model 390129 shell plate is built strictly for 12-gauge shotgun hulls and will not function with 16 ga, 20 ga, 28 ga, or .410 bore hulls. To reload other gauges, you must switch to separate dedicated Hornady 366 shell plates such as the #390141 for 20 Ga or #392078 for .410 Ga.

What maintenance is required to protect the solid steel shell plate from corrosion in my workshop?

The shell plate is precision machined from solid steel and weighs approximately 0.595 lb (~270 grams). Because it is a bare steel component used in workshop environments, standard atmospheric humidity control and a light coat of oil or gun lubricant are recommended to prevent rust and ensure smooth indexing on your 366 Auto press.

Does this shell plate require any electrical setup or Australian regulatory certifications?

No electrical setup or certifications are required. The Hornady 366 Shell Plate is a completely mechanical steel component operated manually through the progressive press stroke, meaning it does not plug into 240V mains power and is exempt from SAA or RCM regulatory approvals.

12 Gauge Shell Plate - Hornady 390129

The Hornady Shell Plate 12 Ga (Part Number 390129) is a precision-machined steel rotary carrier plate engineered specifically for the Hornady 366 Auto progressive shotshell reloader. Weighing approximately 0.595 lb (~270 grams), this component acts as the central rotating hub (schematic Key Part #45) on the press chassis. It secures 12-gauge shotshell hulls by the rim and indexes them automatically across all operational stations, including resizing, repriming, powder charging, wad seating, shot dispensing, and multi-stage crimping.

Key Features

Rotary Indexing: Holds hulls firmly by the rim and advances them sequentially through each station of the progressive reloading sequence.
Precision Steel Construction: Machined from solid steel to deliver exact rim engagement and positive mechanical indexing with the press advance pawl.
Chassis Restoration: Replaces worn, damaged, or grooved shell plates on active 366 Auto presses to restore factory-level alignment and cycling reliability.
Gauge Conversion: Serves as the base carrier component when converting an existing 366 Auto reloader from sub-gauges over to 12 gauge.
Mechanical Simplicity: Operates strictly via manual press actuation, requiring no electrical connections or external power sources.

Specifications

Brand: Hornady Manufacturing Company
Part Number: 390129
Equipment Type: Progressive shotshell reloader shell plate
Calibre/Gauge Compatibility: 12 Gauge shotshell hulls
Press Compatibility: Hornady 366 Auto (and legacy Pacific 366) progressive shotshell reloaders
Weight: Approximately 0.595 lb (~270 grams)
Material: Solid machined steel

Who is the Hornady Shell Plate 12 Ga for?

High-volume clay target competitors — relies on this 0.595 lb (~270 grams) steel shell plate to maintain smooth, continuous auto-indexing across progressive stations when assembling hundreds of 12-gauge rounds per hour for training and match use.
Wing and duck hunters — utilizes this dedicated 12-gauge shotshell press shell plate on the 366 platform to securely hold and cycle heavy-payload field hulls without rim slip to produce high-volume hunting loads at lower costs.
Progressive reloaders converting an existing press — integrates this 0.595 lb (~270 grams) rotary shell plate to switch a sub-gauge 366 Auto press chassis to 12-gauge shotshell production alongside matching drop tubes and dies.

Less suitable for: Reloaders processing sub-calibre shotgun ammunition, as this plate strictly fits 12-gauge hulls and will not function with 16 ga, 20 ga, 28 ga, or .410 bore cases; dedicated sub-gauge shotshell plates are required. It is also completely unsuitable for Hornady Lock-N-Load AP metallic reloading presses, which require dedicated metallic multi-calibre shell plates instead of shotshell chassis components.

SKU	HN42890LP
Model #	390129
Brand	Hornady
Shipping Weight	1.0000kg

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Hornady 390129 Shotshell Press Shell Plate 12 Gauge Steel

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