The Redding .308 Winchester Small Base Full Length Sizing Die (Model 08155) is an unpowered, mechanical reloading tool engineered to resize .308 Winchester and 7.62×51mm NATO cartridge cases below standard SAAMI minimum dimensions. Constructed from heat-treated alloy steel hardened to Rc 60–62, the die reduces the lower case web and body diameter by an additional .001" to .002" compared to standard full-length dies while simultaneously bumping the shoulder back, decapping spent primers, and expanding the case neck. It mounts directly to standard reloading presses via an industry-standard 7/8"-14 thread.

Key Features

• Small-Base Sizing Profile: Sizes the lower case web and body approximately .001" to .002" smaller than standard full-length sizing dies to ensure flawless cycling and chambering in actions with limited primary extraction leverage.
• Complete Full-Length Processing: Decaps spent primers, bumps the cartridge shoulder, resizes the case body, and expands the internal neck diameter in a single mechanical pass.
• Hardened Steel Construction: Precision-machined from alloy steel with hand-polished sizing diameters heat-treated to Rc 60–62 to resist surface wear and reduce friction during sizing.
• Universal Press Compatibility: Features standard 7/8"-14 threads to fit standard progressive and single-stage reloading presses.
• Included Components: Comes complete with the die body, standard 7/8"-14 lock ring, decapping rod assembly (part #23307), and steel size expander button (part #40307). Requires a standard #1 shellholder (sold separately).

Specifications

• Calibre: .308 Winchester / 7.62×51mm NATO
• Mounting Thread: 7/8"-14 thread
• Hardness Rating: Rc 60–62
• Weight: Approx. 0.5 lb (approx. 227 g)
• Operation: Manual/mechanical

Who is the Redding 308 Win Small-Base Full Length Sizing Die for?

• Semi-automatic, pump-action, and lever-action .308 shooters — requires a small base sizing die hardened to Rc 60–62 that reduces case diameter by .001" to .002" more than standard dies to prevent stiff feeding and extraction in actions lacking the mechanical camming leverage of a bolt-action.
• Precision rifle shooters with match-reamed .308 chambers — requires an Rc 60–62 hardened small base sizing die that resizes range-fired or mixed brass to strict tolerances beneath SAAMI minimums, ensuring smooth lockup in custom, tight-tolerance chambers.

Less suitable for: Standard bolt-action hunting rifles where brass is fired in and dedicated to a single generous factory chamber; standard full-length sizing dies or dedicated neck-sizing/bushing dies fit this situation better without over-working the brass.