RIMLESS RIFLE CHAMBERING REAMERS R308WIN

Clymer RIMLESS RIFLE CHAMBERING REAMERS – R308WIN .308 Winchester Rougher Reamer

The RIMLESS RIFLE CHAMBERING REAMERS R308WIN designation refers to the Clymer .308 Winchester Rougher Chamber Reamer, part of Clymer’s Rimless Rifle Chambering Reamers line built for professional gunsmiths. Designed specifically for the .308 Winchester cartridge, this rougher-style reamer removes the bulk of chamber material before final finishing, helping extend the life and accuracy of your finishing reamer. Brownells UK+2Brownells Österreich+2

Product Identity & Line Placement

• Manufacturer: Clymer – long-established maker of precision chamber reamers and gunsmithing tools Primary Tactical+2ammowinner.com+2

• Series: Rimless Rifle Chambering Reamers (for modern rimless rifle cartridges) Brownells+2Brownells+2

• Cartridge: .308 Winchester (7.62×51mm class, commercial .308 Win chambering) Brownells UK+1

• Manufacturer Part Number: R308WIN – listed by distributors and wholesalers as “Clymer 308 Winchester Rougher Reamer” Brownells Österreich+3egoods365.com+3crowwholesale.com+3

Brownells and multiple resellers catalog R308WIN specifically as the Rougher Style Reamer fits .308 Winchester, under the Rimless Rifle Chambering Reamers product family. Brownells UK+2Brownells Österreich+2

Construction – M-7 High-Speed Steel for Professional Use

Clymer chambering reamers are consistently described as being manufactured from best-quality M-7 high-speed steel (M7 HSS). Gunwinner+2ammowinner.com+2

For the R308WIN rougher reamer, that means:

• Material: M-7 High-Speed Steel – chosen for hardness, edge retention, and dimensional stability in precision chambering tools ammowinner.com+2Primary Tactical+2

• Use Level: Precision tool aimed at the professional gunsmith, intended to provide a long service life when properly lubricated, cleaned, and stored ammowinner.com+2Brownells+2

• Made in USA: Many Clymer reamers are explicitly marked and cataloged as US-made tooling. ammowinner.com+2Brownells UK+2

Rimless Rifle Chambering Reamer Geometry

The Rimless Rifle Chambering Reamers line uses standardized geometry across calibers, including .308 Winchester: Gunwinner+2ammowinner.com+2

• Flutes:

  • Six straight, right-hand cutting flutes for smooth, predictable cutting and efficient chip evacuation

• Pilot:

  • Solid pilot to help maintain concentricity with the bore and reduce chatter

• Throat:

  • Line spec includes an integral throat on finishing reamers; roughers typically undersize the body and leave the throat for the finisher Gunwinner+2ammowinner.com+2

• Shank:

  • 7/16" round shank

  • 3/8" square drive section to fit common reamer handles and wrench-style holders Gunwinner+2ammowinner.com+2

• Standard:

  • Built to SAAMI-based .308 Winchester chamber dimensions, per the general Clymer rimless rifle line description Brownells+2Primary Tactical+2

This geometry is specifically profiled in R308WIN for .308 Winchester rough-chamber cutting. Brownells UK+1

Rougher vs. Finisher – Where R308WIN Fits

In Clymer’s rimless rifle series, you typically choose between Rougher and Finisher reamers: ammowinner.com+2brownells.lu+2

• Rougher Reamers (like R308WIN):

  • Cut approximately .010" smaller than final chamber diameter ammowinner.com+2Brownells Österreich+2

  • Do not cut the throat area

  • Intended to remove most of the material when many chambers are being cut, saving wear on the more expensive finish reamer

• Finishing Reamers (e.g., 308 Winchester Finisher, product no. 184050400): Brownells UK+2Brownells UK+2

  • Bring the chamber to final size, including the throat

  • Often used alone when only a few chambers are needed, or following a rougher in high-volume shop work

R308WIN is clearly labeled in EU/UK Brownells catalogs as “Rougher Style Reamer fits .308 Winchester”, with Mfr. No. R308WIN. Brownells UK+1

Cartridge Compatibility – .308 Winchester

This reamer is cartridge-specific and is not a universal tool:

• Fits Cartridge: .308 Winchester (standard commercial .308 Win chamber) Brownells UK+1

• Type: Rimless Rifle Rougher Reamer for .308 Win chambers

It’s intended for:

• New barrel chambering in .308 Win

• Re-barreling or re-chambering projects that are appropriate and safe for .308 Win pressures and dimensions

All work must follow standard industry practices and use the correct .308 Winchester GO / NO-GO headspace gauges and inspection methods.

Intended Use & Professional Application (Neutral)

Online catalogs such as Brownells, Gunbroker, Yellowstone Armory, and others list RIMLESS RIFLE CHAMBERING REAMERS R308WIN under gunsmithing tools, reamers & cutters, or equipment & tools, not general hobby tools. GunBroker+2Brownells+2

Neutral guidance for the Clymer .308 Winchester Rougher Reamer R308WIN:

• Designed for qualified gunsmiths and experienced machinists

• Intended for use with:

  • Lathe or properly set up barrel-chambering fixtures

  • Quality cutting oil for chambering work

  • Correct headspace gauges, measuring instruments, and inspection procedures Primary Tactical+2Brownells+2

• Chamber work changes the internal structure of the barrel and must be performed only on appropriate actions and barrel blanks rated for .308 Winchester

All use should comply with:

• Accepted gunsmithing practices

• SAAMI reference data for .308 Win

• All applicable local, state, and federal regulations related to firearms modification and gunsmithing activity

Technical Specifications – Clymer RIMLESS RIFLE CHAMBERING REAMERS R308WIN

• Manufacturer: Clymer crowwholesale.com+2yellowstone-armory.com+2

• Series: Rimless Rifle Chambering Reamers Brownells+2Brownells+2

• Cartridge: .308 Winchester (7.62×51mm commercial) Brownells UK+1

• Reamer Type: Rougher Style Reamer (rimless rifle) – R308WIN Brownells UK+1

• Material: M-7 High-Speed Steel (M7 HSS) Gunwinner+2ammowinner.com+2

• Flutes: Six, right-hand cutting, straight flutes Gunwinner+2ammowinner.com+2

• Pilot: Solid pilot for bore alignment

• Throat: Rougher – undersize body / no throat cutting; throat is finished by the companion finishing reamer ammowinner.com+1

• Shank: 7/16" round shank with 3/8" square drive Gunwinner+2ammowinner.com+2

• Standard: SAAMI-based .308 Winchester chamber geometry within Clymer’s Rimless Rifle line Brownells+2Primary Tactical+2

You can round out your product page for RIMLESS RIFLE CHAMBERING REAMERS R308WIN with:

• Current pricing and stock level

• Shipping options and any “professional use only” guidance

• Links to the matching .308 Winchester Finishing Reamer (F308WIN / product no. 184050400) and .308 headspace gauge sets for a complete chambering solution Brownells+2Primary Tactical+2

The End