Description Bore Tech’s Proof-Positive Chamber Mops are densely packed, 100 % cotton mops that are perfect for cleaning the chamber area and removing any cleaners left behind after cleaning the barrel. Made with attention to quality and detail these chamber mops are a must have in every shooter’s range box. These mops are best used in conjunction with our Bore Tech Action Cleaning Tools and feature non brass cores and threads to prevent any false indication of copper fouling during use with copper removing chemicals. Available in 3 sizes (small, medium and large) our Proof-Positive Chamber Mops are a must have in every shooter’s range box.   Size Threads Length Small 8/32 2.6″ Medium 8/32 2.6″ Large 8/32 2.6″ Chamber Mop Size Chamber Small .22 Hornet .22 PPC .221 Cal .222 Cal .223 Cal 6mm PPC Medium .22/.250 Cal .243/6mm .260 REM .270 Cal 6.5 Creedmoor .280 Cal 7mm-08 .30-06/.308 Cal Large 7mm Mag .300 WIN Mag .338 Lapua Mag ALL MAGNUMS