All of my bullet to bore shooting barrels I clean around every 30 to 40 rounds,,, I usually don't try a group until I've got four or five shots on the barrel and I consider the first group out of a clean barrel in a sense to just be a fouling group rather than one foul shot I don't expect the barrels to group into a hole until the 4th or 5th bullet! I too have read about a lot of others that don't clean until they're getting accuracy issues my mind has just not been able to let me do that,, not that I'm a clean freak either. I do have a couple of barrels that seem to foul a little bit more than the others I can feel that when I'm seating a bullet, when it really kind of gets a crunchy hard feel I usually will stop and clean, but but I do have some barrels that don't have quiet as good a bore that feel a little crunchy no matter what load or bullet or how many shots I have on them. One thing I am noticing with the 209 primed Omega barrel that I got from Woodman arms that I'm shooting light smokeless loads in I've cleaned every 20 shots,, Woodman arms plug is staying much cleaner than my Arrowhead or hankins plug would with a large rifle primer and a brass module I did not expect that,,, perhaps it's the kind of steal that Mark is using I don't know,, I have the answer for that I sure didn't expect it . Shooting 209s in the smokeless is making me look at the whole primer issue a little differently now at least in this gun.