One thing I'd watch out for and that is the way the twisted, wire "shank" of the brush is made. Most come with a rounded (bent end forming a loop) top but I still see some where the top of the brush has a split end, that is, the metal, twisted shank is cut at the top, leaving two sharp points that could cause damage if care isn't taken on the down stroke of the rod.
Though I admit to being a compulsive cleaner of center-fire bores, I don't worry much about rim-fire bores past the point of just running a lightly lubricated patch through them as an aid in preventing rust (and that's only if I don't plan on shooting them again for a long while).
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