The Pro-Shot "The Stopper" Adjustable Bore Guide (.303–.375 Calibre Short or Long Actions) is a mechanical rifle maintenance tool engineered to align cleaning rods directly with the bore axis of medium-to-large-bore bolt-action rifles. By replacing the rifle's bolt during maintenance, this bore guide protects the chamber throat and rifling from rod bowing and friction wear, while preventing chemical solvents, copper strippers, and fouling residue from leaking back into the action or trigger mechanism.

Key Features

• Precision Alignment: Centers the cleaning rod with the bore axis to eliminate rod flex and prevent abrasive wear to the chamber and rifling throat.
• Adjustable Action Lock: Features an anodised aluminium locking collar with an adjustable brass pin that securely seats into the receiver's bolt raceway, accommodating both short- and long-action rifle lengths.
• Action & Trigger Protection: Seals off the chamber area to contain bore cleaners, preventing aggressive solvents and loosened debris from entering the trigger assembly.
• Chemical-Resistant Materials: Constructed from aircraft-grade anodised aluminium, chemical-resistant Delrin guide tips, and brass hardware for durability against harsh cleaning chemicals.
• Integrated Solvent Port: Built-in solvent port on the Delrin rear guide allows direct, mess-free application of bore solvents to patches and brushes.

Specifications

• Calibre Compatibility: .303 in (7.7 mm) to .375 in (9.5 mm)
• Action Compatibility: Short and long bolt-action receivers, including Remington (700, 40X, 78, 722, 725, 788, XP-100, Model 7, 600, 660), Ruger (Model 77 variants), Winchester (70, 54, 56), Savage (110, 112V), Mauser 98, Enfield 1917, Browning A-Bolt, Dakota, Hart, Stolle, and Kimber 89
• Materials: Aircraft-grade anodised aluminium tube and collar, Delrin tips, and brass locking pin
• Packaged Dimensions: Approximately 25 × 10 × 5 cm
• Packaged Weight: Approximately 0.5 kg
• Power Requirements: None (unpowered mechanical tool)

Who is the Proshot Bore Guide - 303-375 Cal Short Or Long Actions for?

• Australian recreational hunters — requires a dedicated bolt action rifle bore guide sized precisely for .303 British (7.7 mm) hunting and military surplus rifles across standard short and long actions to prevent chamber throat wear and keep cleaning solvents out of the receiver.
• Long-range precision and benchrest shooters — maintains bore concentricity and protects the precision chamber throat when servicing large-bore magnum platforms ranging from .338 calibre up to .375 calibre (9.5 mm).

Less suitable for: Bolt-action rifles with bore diameters below .303 in (such as .22 to .30 cal / 7.62 mm), which require a dedicated .22–.30 calibre bore guide, or calibres exceeding .375 in (such as .416 or .458 cal), which require a large-bore .375–.458 calibre bore guide.