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If your brush is straight and true to the rod and rod properly sized to the bore, you will not harm the crown since only the bristles will contact the crown.I start at the neck/leade area and go a few inches in, pull back and increase the depth into the barrel a couple inches with each stroke, finally stopping just short of the crown (I have my cleaning rod marked so it's not a guess) then take 4-5 full length strokes and then finally all the way out. Wet and dry patch, look with the bore scope, repeat if necessary. Also, patch on jag, not on brush with abrasives for me. I will use patch on brush for higher solvent retention, though (Boresmith jag brush).
You use to plug the chamber without remove the barrel from the action?Chamber plug and bore solvent soak. So many different ways to get that barrel clean.
With a JB'd patch on a bronze brush, you can easily reverse the brush in the bore. I do it routinely in the first 5-6" of the barrel. You can let it come all the way out the muzzle or not. Both ways work.
For regular cleaning with a bronze brush, you don't want to try to reverse the brush direction when it's in the bore. Ditto the blue Iosso brushes.
Yes...as I mentioned.Okay, you can't do it with the Iosso brush unless you enter Beast mode!