I do some dog hunting, I live in Montana so it is something I grewup doing and grew to love. I only had one gun for several years, a Cooper Model 21 mtv 204, I got it after I could afford to shoot something other the a 22 or my 22 mag. I found that it liked a cleaning between 150 and 175 rounds. It is very easy to tell when it needs cleaned, one shot one dog, then the next three will be misses. I always take a little box with a cleaning rod, nylon brush, patches, and a cleaner, I use Blue Wonder. Cover the brush with cleaner, run it thru the barrel 6-7 time, have a drink and a snack, run a patch or 2 thru it and back to shooting. I have also found that a clean rod is a must if shooting dogs all day, I can't remember the last time I went out and didn't have a piece of brass stick in the chamber, things get dusty, gumed up and a cleaning rod has determined weather we go home at noon or dark several times. Again time is not a big thing for me as I am shooting for fun, but this was my regiment for several years. I now have a couple of more rifles, a 223, 220, and a 222, but I still find I shoot my 204 enough that I end up cleaning it at least once on a weekend shoot just because I love to shoot it.