I think that if you are shooting a high quality lapped barrel in a rifle that is not capable of benchrest accuracy, and the powder does not create an unusual amount of fouling, that you can probably shoot a lot more rounds before you see obvious signs of a decrease in accuracy, than would be the case with a well tuned, full house benchrest rig, shot over flags, on a good day. Also, the ratio of bore diameter to case capacity, and velocity are factors, the latter being a consideration for jacket fouling. I would also say that in my experience higher pressure loads generally burn cleaner, and may be and advantage in that respect as long as the rate of fire does not create a barrel heat issue, and jacket fouling is not exacerbated by the velocity. Typically, I have confidence that any of my current 6ppc barrels can easily go 30 shots with no accuracy fall off, and at that point, if I am shooting 133, I can clean the barrel with something like BBS and a few short stroked patches, and go back to shooting without brushing (bronze). After doing that once or twice, I will do a more complete cleaning. Other powders do not allow so little cleaning, and for those I brush every time. Recently, I have tried Patch Out in combination with Accelerator, wetting the bore with a couple of loose patches, and then applying both to a relatively soft nylon bore brush, and cycling it up and down the bore (I can easily reverse it in the muzzle.) slowly (2-3 seconds per cycle) 15-30 cycles, depending on the round count. letting it sit for 15 minutes, and then patching it out, drying the chamber and muzzle ( and putting a thin film of greas on the backs of the lugs, and more on the cocking cam). This seems to be an easy way to clean that works within the time frame that I require, and seems to pose a minimum of risk to the barrel. I use a bore guide of the highest quality, that has an additional tube that stays on the rod that extends as far forward as it can without interfering with either brush or jag.