Being consisent is the key to a good shooting rifle. If you want a rifle to shoot the same every shot, the barrel must be in the same condition for every shot. That could go either way. Sparkling clean for every shot, or somewhat fouled for every shot. I only scrub my rifle barrels when the accuracy falls off, other than that, a patch with some Hoppe's #9 is all it gets. When I do scrub them, I find that it takes 10 to 20 shots before it settles back down. But you have to remember that fouling draws in moisture, so if your barrel is fouled, you must store it in a dry spot to keep the barrel from rusting.
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