ORIGINAL: SwampCollie
Thats certainly true of high volume of fire weapons such as you devil dogs use. On hunting rifles, I use a practice that not a lot of folks do... once I have my rifle dialed in before the season.... I don't clean the bore at all until after the season is over, save perhaps a dry patch to remove debris. Rationale there of course is that any oil in your bore at all will cause you to shoot to a different point of impact. So you either need to sight in ALWAYS with a clean barrel... or hunt with a dirty one.
True. It effectively eliminates your cold bore shot when you leave the bore "dirty". A common practice used by competition shooters. The only time you'll see someone cleaning their barrel is if they're done for the day. Once the POI is where you need it to be, leave it alone.