Bring classic Krag rifles back to life—or build a new one the right way—with the Rimmed & Belted Rifle Chambering Reamer – Clymer 30-40 Krag Finisher, MFR # F3040KRAG. Designed for professional gunsmiths working on .30-40 Krag rifles, this finisher-style chamber reamer delivers the precision, consistency, and durability you need to cut SAAMI-spec, match-quality chambers in vintage and custom barrels alike. Brownells Österreich+2Brownells Deutschland+2
Precision 30-40 Krag Chambering for Classic Rimmed Rifles
The F3040KRAG is purpose-built for the .30-40 Krag cartridge, one of America’s most iconic early smokeless rifle rounds. Brownells Österreich+2Brownells UK+2
Whether you’re restoring a Krag–Jørgensen, building a custom sporting rifle, or correcting a worn factory chamber, this tool is engineered to cut clean, concentric, correctly dimensioned chambers for reliable feeding, firing, and extraction.
Finisher-Style Reamer for SAAMI-Spec Chambers
This model is a finisher chamber reamer, designed to cut the chamber to final size and form the throat: Brownells+3Brownells+3Primary Tactical+3
SAAMI-spec geometry for .30-40 Krag ensures compatibility with commercial ammo and dies
Cuts the full chamber and throat, delivering a ready-to-fire chamber when used correctly
Ideal when you’re cutting only a few chambers or performing final sizing after a rougher reamer
Clymer’s finisher reamers are renowned for producing chambers that support excellent accuracy, safe pressures, and smooth case life when paired with proper barrel work and headspace gauging.
Premium M-7 High-Speed Steel Construction
Like the rest of Clymer’s Rimmed & Belted Rifle Chambering Reamer line, the F3040KRAG is made from top-grade M-7 high-speed steel, chosen for its toughness, wear resistance, and ability to hold a sharp cutting edge. Brownells Schweiz+3Brownells Österreich+3Brownells Deutschland+3
Material: M-7 HSS – hardened and drawn for long service life
Built for use with proper cutting oil and lathe setups
When correctly cared for, these reamers are fully guaranteed and designed to give a lifetime of professional service
This level of metallurgy means you can cut multiple barrels with consistent results and minimal tool degradation.
6-Flute, Right-Hand Cutting Design with Solid Pilot
Clymer’s Rimmed & Belted Rifle Chambering Reamers share a common, shop-proven geometry—and the F3040KRAG is no exception: Brownells+3Brownells+3Primary Tactical+3
6 right-hand cutting, straight flutes for smooth, stable cutting
Solid pilot helps keep the reamer aligned in the bore, reducing chatter and misalignment
Integral throat – the throat geometry is built into the tool, ensuring a correct, concentric lead into the rifling
This combination produces clean chips, a smooth surface finish, and minimal chatter, reducing follow-up polishing and helping maintain chamber uniformity.
7/16" Round Shank with 3/8" Square Drive
For easy setup in a variety of professional tooling arrangements, the F3040KRAG uses the standard Clymer rifle reamer shank: Brownells+2Brownells Schweiz+2
This makes it straightforward to integrate into your existing lathe, tailstock, or dedicated reamer holder, depending on your chambering workflow.
Rougher & Finisher System – Use as Your Final-Cut Tool
Clymer’s system offers both rougher and finisher reamers in this line; the F3040KRAG is the finisher: Brownells+3Brownells+3Brownells Schweiz+3
Rougher reamers (sold separately) are typically .010" smaller in diameter and do not cut the throat, intended to save wear on the finisher when cutting many chambers.
The finisher reamer (F3040KRAG) brings the chamber to final diameter and forms the throat to spec.
If you’re a small shop or only cutting a handful of .30-40 Krag chambers, the finisher reamer alone is all you need to complete the job (used with proper technique and headspace gauges).
Made in the USA – Professional Gunsmithing Quality
Clymer’s Rimmed & Belted Rifle Chambering Reamers are manufactured in the USA, aimed squarely at the professional gunsmith market. Brownells Deutschland+2Brownells Schweiz+2
Superb workmanship and finish help ensure repeatable, high-precision cuts
Produced to SAAMI specifications, so your finished chamber matches standard ammo, dies, and gauges
Backed by Clymer’s reputation for decades of service in serious shops
For customers, that means a better-finished rifle. For gunsmiths, it means a tool you can put to work every week.
Ideal Applications – Where the F3040KRAG Shines
The RIMMED & BELTED RIFLE CHAMBERING REAMERS – F3040KRAG is perfect for:
Rebarreling classic Krag rifles for hunting or historical shooting
Building custom .30-40 Krag sporting rifles on modern or vintage actions
Correcting out-of-spec, pitted, or damaged chambers in older barrels (where safe to do so)
Any shop that regularly services rimmed rifle cartridges and wants a dedicated, SAAMI-correct .30-40 Krag finisher
As with all chambering operations, this tool is intended for experienced gunsmiths using proper fixturing, lubrication, and correct headspace gauges.
Key Specifications – RIMMED & BELTED RIFLE CHAMBERING REAMERS F3040KRAG
From Brownells, Clymer distributors, and technical listings: Primary Tactical+3Brownells Österreich+3Brownells Deutschland+3
Product Line: Clymer Rimmed & Belted Rifle Chambering Reamers
Model: 30-40 Krag Finisher Chamber Reamer
Manufacturer Part Number: F3040KRAG
Cartridge: .30-40 Krag (Rimmed Rifle)
Style: Finisher chamber reamer (Rimmed Rifle)
Material: M-7 high-speed steel
Flutes: 6, right-hand cutting, straight flutes
Pilot: Solid pilot
Throat: Integral throat design
Shank: 7/16" round shank
Drive: 3/8" square drive
Standards: Made to SAAMI specifications
Country of Origin: Made in USA
Why Choose the F3040KRAG 30-40 Krag Finisher Chamber Reamer?
Cartridge-specific, SAAMI-correct design for the classic .30-40 Krag
Professional-grade M-7 HSS for long life and dependable performance
Solid pilot, integral throat, and 6-flute geometry for smooth, accurate cutting
Part of Clymer’s trusted Rimmed & Belted Rifle Chambering Reamers line, used by gunsmiths worldwide
Ideal as a primary finisher reamer for shops chambering or restoring .30-40 Krag rifles
If your workbench sees Krag–Jørgensen builds, restorations, or custom .30-40 projects, the RIMMED & BELTED RIFLE CHAMBERING REAMERS F3040KRAG belongs in your chambering toolkit.
The End
