RCBS Trim Pro Case Trimmer Shellholder #13

The RCBS Trim Pro Case Trimmer Shellholder #13 (RCBS part no. 90313) is a precision accessory for handloaders running the RCBS Trim Pro case trimmer system. RCBS built its reputation on tight-tolerance reloading tools, and this shellholder is machined to hold a case perfectly square in the trimmer head so every cut comes out consistent. It’s a small part that solves a real problem: without a correctly matched shellholder, trimmed case lengths drift and neck tension becomes unpredictable. Handloaders chasing accuracy at the bench, whether loading precision rifle or competition pistol brass, rely on shellholders like this to keep case prep repeatable.

Key Specifications

• Designed as Shellholder #13 in the RCBS numbering system, matching a specific case head diameter for a correct, secure fit.
• Built for use with the RCBS Trim Pro case trimmer, holding brass steady so the cutter produces a consistent trim length.
• Constructed from hardened steel, which resists wear from repeated case insertions during high-volume case prep sessions.
• Machined to tight tolerances, centering the case precisely so the cutter produces a square, even trim.
• Sold as a standalone accessory, letting a handloader add another case head size to an existing Trim Pro setup without buying a new trimmer body.

Frequently Asked Questions

Does this shellholder fit any case trimmer? It’s designed specifically for the RCBS Trim Pro case trimmer system, not universal trimmer stands.

Why does the shellholder number matter? Each RCBS shellholder number corresponds to a specific case head diameter, so using the correct number keeps the case centered and square during trimming.

Buy the RCBS Trim Pro Case Trimmer Shellholder #13

Round out your case prep station with the correct RCBS shellholder for your Trim Pro trimmer. Order it from our Lubbock, Texas gun shop for fast, insured shipping, and browse our full case preparation lineup for the rest of your bench setup.