I prefer bronze brushes (lately been buying BoreTech products) - pushed and pulled in only one direction (from the breech end) while they are in the bore (that is - don't reverse it while compressed in the bore).
Rather than relying on a lot of mechanical scrubbing I use Barnes CR-10 occasionally to remove copper fouling.
Whether "more aggressive" is "too aggressive" I can pretty much assure you that if you ever shoot unjacketed lead bullets (rifle or pistol) you either use bronze/brass brushes or you have a leading problem. You can probably harm your bore equally with Nylon if you don't use some care. A one-piece rod is a great investment
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