Forster "S" Shellholder Jaws for Co-Ax Press

• Floating jaw design: The “S” Shellholder Jaws let the cartridge case find its natural center in the die, which helps reduce run-out and supports straighter, more consistent ammunition.
• Spring-loaded operation: The jaws open and close automatically during the press stroke, speeding up handling and making case insertion and release more efficient on a Co-Ax press.
• Positive case support: By contacting the base of the cannelure, the jaws hold the case securely for reliable extraction while maintaining the self-aligning character of the Co-Ax system.
• Standard Co-Ax fit: These are the factory “S” jaws for the Forster Co-Ax Press, making them the correct replacement choice for reloaders who want to keep the original operating geometry of the press.
• Broad standard rim coverage: With small and large working ends in one jaw set, they cover many common case-head sizes without switching to an adapter plate, keeping caliber changes simple.

About the Co-Ax Series

The Forster Co-Ax series is built around a different approach to single-stage reloading. Instead of relying on a fixed shellholder that locks the case in one position, the system uses floating shell holder jaws so the case can self-center in relation to the die. That alignment concept is a defining part of the Co-Ax design and is one reason the series is widely chosen by reloaders who place a high value on concentricity and repeatable die-to-case alignment.

Co-Ax presses are intended for precision handloading, from careful hunting loads to match ammunition for target shooting. The design also emphasizes smooth handling, with spring-loaded jaws that open and release automatically as the press cycles. This reduces interruptions during sizing and seating while preserving the alignment benefits that distinguish the platform from conventional press systems. Within the Co-Ax family, jaw options such as the standard “S” and the larger-range “LS” versions allow the press to accommodate different case-head dimensions while keeping the same self-aligning operating principle.

About the Forster "S" Shellholder Jaws for Co-Ax Press

The Forster “S” Shellholder Jaws for Co-Ax Press are the standard jaw set used in the Co-Ax system and are designed for reloaders who want to preserve the press’s original self-aligning function. Their key advantage is not simply that they hold the case, but that they do so in a way that allows the cartridge to float into exact alignment with the die. In practical terms, that helps support straighter case entry, more consistent bullet seating, and reduced run-out compared with more rigid shellholding arrangements.

The jaws are spring-loaded, so they automatically open and close as the case is inserted and withdrawn during the press stroke. That makes operation faster and more fluid than manually fitting a conventional shellholder, especially when working through repeated sizing or seating steps. They also support the case at the base of the cannelure for more positive extraction, which helps maintain control of the case without giving up the floating action that makes the Co-Ax system distinctive.

As the factory standard jaw type for the Co-Ax press, the “S” version is the correct choice for many common cartridges. The two working ends cover standard rim ranges from .343" to .422" on the small end and .468" to .562" on the large end, giving the jaw set useful versatility while keeping the simple, direct operation that precision-minded handloaders expect from the Co-Ax platform.

About Forster

Forster Products dates its history to 1935 and has long focused on tools for precision reloading and gunsmithing. Based in Lanark, Illinois, the company states that its products are made in the United States. Its catalog covers core handloading and shop equipment such as reloading dies, case trimmers, headspace gauges, and sight-mounting fixtures, reflecting a strong emphasis on dimensional consistency and repeatable setup.

The Co-Ax Press is one of the company’s established reloading products, alongside Bench Rest die systems such as the Bench Rest Ultra Micrometer Seater Dies. Across these product lines, Forster’s design approach centers on alignment and control during the loading process, which makes the brand particularly well known among reloaders building accurate hunting and target ammunition.

Main Features

• Manufacturer: Forster
• Product type: Shellholder jaws for Co-Ax press
• Compatibility: Presses
• Press compatibility: Forster Co-Ax Press
• Jaw type: “S” (Standard)
• Operation: Spring-loaded, self-acting jaws
• Small-end rim range: .343" to .422"
• Large-end rim range: .468" to .562"
• Function: Floating case alignment for self-centering in the die

Warranty

Forster provides a 2-year warranty for this product. That period gives clear coverage for defects in materials or workmanship under normal use.