The Proshot 338 Cal/8.7mm Rifle Chamber Brush is a dedicated rifle chamber cleaning brush engineered to scrub carbon, powder residue, and brass shavings directly from firearm chambers. Made in the USA, it features an oversized diameter and shorter overall profile compared to standard bore brushes, matching the specific chamber dimensions of .338 calibre centerfire rifles. The heavy-duty phosphor bronze bristles and looped brass core allow for vigorous cleaning without scratching or altering critical steel chamber walls and headspace surfaces, helping prevent cartridge sticking and extraction failures.

Key Features

• Calibre-Specific Geometry: Sized specifically for .338 Cal / 8.7mm centerfire chambers to thoroughly clean the chamber body, shoulder, and neck areas.
• Phosphor Bronze Bristles: Heavy-duty, densely packed bronze bristles provide stiff mechanical scrubbing action while remaining softer than chamber steel.
• Safe Brass Core: Built with a brass core and a looped/rounded tip that eliminates sharp cut-wire ends, protecting the chamber and throat from scratching.
• Standard Thread Mounting: Fitted with an industry-standard American #8-32 male thread, offering direct compatibility with standard cleaning rods and chamber tools.
• Targeted Maintenance: Specifically designed to eliminate fouling buildup that causes hard extraction and pressure variations in heavy-recoil centerfire actions.

Specifications

• Product Name: Pro-Shot .338 Cal / 8.7mm Rifle Chamber Brush
• Model / SKU: 338BC
• Calibre / Bore Interface: .338 Calibre / 8.7mm centerfire rifle chambers (e.g., .338 Lapua Magnum, .338 Winchester Magnum, .338 Federal, .338 Edge)
• Bristle Material: Phosphor bronze
• Core / Coupling Material: Brass
• Thread Fitting: Standard American #8-32 male thread
• Country of Origin: United States
• Weight: Under 15 g

Who is the Proshot 338 Cal/8.7mm Rifle Chamber Brush for?

• Competitive long-range precision shooters — requires a dedicated rifle chamber cleaning brush engineered precisely for .338 Cal / 8.7mm centerfire chambers like the .338 Lapua Magnum to remove high-pressure carbon buildup and maintain uniform cartridge seating.
• High-volume hunters — needs a chamber tool equipped with heavy-duty phosphor bronze bristles and an American #8-32 male thread to quickly clear brass shavings and powder residue from .338 Winchester Magnum actions, preventing field extraction failures.

Less suitable for: Rifle chambers smaller than .338 Cal / 8.7mm (such as .308, 6.5mm, or .243), where the oversized diameter prevents proper seating into the chamber shoulder and neck; shooters using those calibres require a calibre-matched .30 Cal or 6.5mm chamber brush. Additionally, cleaning routines relying on aggressive ammonia-based copper-dissolving solvents require a chemical-resistant nylon chamber brush, while full barrel cleaning over the entire length of the bore requires a standard .338 bore brush rather than a chamber tool.