Sure wish there was a MAGIC number of patches wet and dry, as I have spent over 3 hours trying to get the carbon out of a 17 HMR.
Go figure I just put close to 400 RDS thru it since it was cleaned last and there is no telling if I had it REALLY CLEAN from the last time I put close to 450 rounds thru it the last time. Could be it wasn't Completely clean form last years rat shooting trips.
Using Hoppees #9 bore solvent and a Nylon bristle brush.
DAB