Tips : (I learned the hard way)
Open the cylinder . Use some CLP on the brush and barrel first . Insert brush from muzzle , new brush will be tight , push it all the way through ...Do Not go halfway down the barrel and try to pull the brush out...the bristles will not easily reverse in the barrel ...shove the brush through then pull it back into the barrel and out .
Nylon Bristle brushes don't clean quite as well but they are easy to push and pull through and Nylon will not damage a thing .
After a couple uses the brush will compress and be easier to use .
They will wear out...I wrap the worn out brushes in 0000 steel wool to get a little more cleaning use...wrapped brushes are good for cleaning the cylinder chambers and throats .

J. B. Bore Cleaning Paste is your friend ... get some and keep it in your cleaning kit , follow the directions for use.
Gary

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Certified Cajun
NRA Member