Is this shell plate compatible with newer Lee progressive presses like the Six Pack Pro?

No. The Lee Precision 90907 #1s Shell Plate is exclusively engineered for the legacy Lee Load-Master progressive reloading press and will not fit other Lee presses such as the Pro 1000, Pro 4000, Auto Breech Lock Pro, or Six Pack Pro.

Which specific calibers can I reload using the Lee 90907 #1s shell plate?

This shell plate is specifically designed for .38 Special, .357 Magnum, and identically dimensioned rimmed handgun cartridges featuring a rim diameter of .440 inches and a thickness of .059 inches. The integrated small primer setup ('s' designation) optimises it for reliable priming on the Load-Master press.

How should I maintain this steel shell plate to prevent corrosion in humid Australian environments?

The shell plate is crafted from machined steel with a protective finish, but it can still be vulnerable to surface rust in humid conditions or coastal workshops. We recommend keeping it stored in a dry indoor reloading environment and applying a light coat of gun oil or rust preventative after use to ensure longevity across tens of thousands of rounds.

Load Master Shell Plate - Lee Precision 90907

The Lee Precision Load-Master Shell Plate #1s (MPN 90907) is a machined steel progressive reloading accessory engineered exclusively for the Lee Load-Master press platform. Weighing approximately 0.30 lbs (~136–159 g), this 5-station shell plate holds, indexes, and precisely positions .38 Special and .357 Magnum cartridge cases through each stage of progressive reloading. The "#1s" configuration is specifically matched to small primer seating systems and standard rim dimensions (.440 in / 11.2 mm rim diameter, .059 in / 1.5 mm rim thickness), allowing reloaders to achieve typical production rates of 300 to 500 rounds per hour on an operational Load-Master carrier.

Key Features

5-Station Progressive Indexing: Holds up to five cartridge cases simultaneously, guiding them sequentially through sizing, priming, charging, seating, and crimping dies.
Optimised "1s" Configuration: Engineered specifically for .38 Special and .357 Magnum brass with small primer pocket feeding systems on the Load-Master carrier.
Machined Steel Construction: Manufactured with a silver finish for dimensional rigidity and resistance to wear under continuous indexing cycles.
Direct-Fit Interchangeability: Facilitates quick calibre conversions on existing Load-Master presses when paired with appropriate die sets and priming components.

Specifications

Manufacturer Part Number (MPN): 90907
Material: Machined steel
Finish: Silver
Weight: Approximately 0.30 lbs (~136–159 g)
Packaged Dimensions: Approximately 3.4" L × 2.7" W × 0.7" H (86.4 mm × 68.6 mm × 17.8 mm)
Station Capacity: 5 stations
Calibre Compatibility: .38 Special, .357 Magnum, and identically dimensioned rimmed cases (.440 in / 11.2 mm rim diameter, .059 in / 1.5 mm rim thickness)
Press Platform: Lee Precision Load-Master progressive press only

Who is the Lee Precision Load-Master Shell Plate #1s for?

Cowboy Action Shooting competitors — reloading high volumes of .38 Special and .357 Magnum ammunition requiring a progressive reloading press shell plate tailored precisely to .440 in (11.2 mm) rim diameter and .059 in (1.5 mm) rim thickness brass.
High-volume target shooters maintaining legacy Lee Load-Master presses — sustaining 5-station progressive loading output at 300 to 500 rounds per hour on an existing Load-Master platform using a 0.30 lb (~136–159 g) dedicated shell plate.

Less suitable for: Reloaders operating alternative press designs such as the Lee Pro 1000, Pro 4000, Six Pack Pro, or standard single-stage presses, or those loading cartridges with case heads outside .440 in (11.2 mm) rim diameter dimensions; these setups require press-specific progressive shell plates or standard universal single-stage shell holders matched to their respective carrier geometry.

SKU	LE102222LP
Model #	90907
Brand	Lee Precision
Shipping Weight	0.2000kg

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Lee Precision 90907 Load Master Shell Plate 38 Special 357 Magnum

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