Flat-shooting calibers like the .25-06 and .257 Roberts push bullets at high velocity - and that velocity leaves copper jacket fouling behind in the bore. This .25 caliber brass bore brush uses phosphor bronze bristles to scrub out copper and carbon deposits without touching your rifling.
The .25 caliber holds a dedicated following among western hunters who value its flat trajectory and light recoil for open-country shots. It's a niche caliber, which means finding bore cleaning accessories sized specifically for it isn't always easy. This brush is built to match the .257" bore precisely - proper fit means better bristle contact and a more effective clean than using an undersized or oversized brush.
Solvent first, then this rifle cleaning brush, then a dry patch to check your progress. That's all it takes for reliable gun cleaning that keeps your .25 caliber shooting as flat as the day you sighted it in.