12 bore brushes bronze .303/7.7mm long guns

Caliber .303 and/or 7.7mm long guns, 12/twelve barrel brushes with bronze bristles with brass core and rounded head, external thread #8-32Inch, Benchrest Type Code 303R-D Pro-Shot USA.
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Note from Pro-Shot USA:
Pro-Shot manufactures high-quality barrel brushes for shooters that withstand frequent use. They consist of a high-quality brass core and extra thick bronze bristles. These brushes have been used over the years worldwide to set world records. They clean the barrel exceptionally well while also being gentle on it. All Pro-Shot Benchrest barrel brushes are specifically tailored to the respective caliber/mm and are oversized to ensure a long lifespan and maximum cleaning power.