Chadwick & Trefethen ''B'' Adjustable Reamer

The Chadwick & Trefethen "B" Adjustable Reamer is a precision gunsmithing tool built for shootgun choke work and 1911 barrel fitting. Whether you're a serious reloader, a gunsmith, or an armorer maintaining a collection, this reamer delivers the control and repeatability you need for clean, consistent cuts across multiple gauges and applications.

Designed for 10, 12, 16, 20, and 28 gauge shotguns, plus .410, the "B" reamer handles the full range of common shotgun bores. The blade angle is engineered to eliminate chatter during the cut, giving you smooth, controlled results every time—no vibration, no rough edges. That precision matters: a poorly reamed choke or barrel bushing can compromise fit, function, and accuracy. The "B" reamer gives you the tool to do it right.

This is also a go-to tool for 1911 Auto work. If you're fitting match-grade barrel bushings or doing detailed 1911 gunsmithing, the "A" and "B" reamers in the Chadwick & Trefethen lineup are especially useful for achieving the tight tolerances those rifles demand. To get the most from any reaming process, the manufacturer recommends pairing this tool with a barrel hone and caliper to complete your setup and verify your work.

Key Features

• Handles 10, 12, 16, 20, and 28 gauge shotguns, plus .410
• Blade angle design reduces chatter for clean, controlled cuts
• Purpose-built for shotgun choke work and 1911 barrel fitting
• Adjustable design for precise tolerance control

Frequently Asked Questions

What gauges does this reamer work on?

The "B" Adjustable Reamer is designed for 10, 12, 16, 20, and 28 gauge shotguns, as well as .410.

Can I use this for 1911 gunsmithing?

Yes. The "A" and "B" reamers in the Chadwick & Trefethen line are especially useful for 1911 Auto barrel bushing fitting and similar precision gunsmithing work.

What other tools should I have with this reamer?

Chadwick & Trefethen recommend pairing this reamer with a barrel hone and caliper as integral parts of the reaming process to ensure proper fit and finish.

Why does the blade angle matter?

The blade angle is engineered to eliminate chatter during the cut, resulting in clean, controlled reaming work without vibration or rough edges.