Cleaning .30 Cal??

I use a home made setup made from some nylon 3D printer filament. I melted the end to form a small widened area to hold a patch while it is pulled through the barrel. Many use string trimmer line but I hesitate to use it since most string trimmer line has abrasives added to the plastic formulation which I do not want touching the bore of my barrel.

Alternately many use a "Bore Snake" available online and at most sporting goods locations that deal in guns.

Thurmond