I often shoot strings of 100 rounds starting off with a clean and lightly oiled bore and have not ever seen a difference in accuracy from the beginning to the end. No one shoots more accurately than Bench Rest shooters and they clean often during a match. But your experience may be different
Wow I've seen a LOT of difference. It depends on the rifle. Remember those BR guys are shooting with very tight chambers and bores and it takes a lot less to cause problems from fouling. A number of top barrel makers (including some BR barrel makers) suggest not cleaning the barrel that often because it removes the lube your bore needs to stay accurate. For example I found this comment on barrel maker Lilja's web page
"Match quality bullets have a wax coating on them that aids accuracy. It may take 10-50 shots to "lay" a good coating of it down in the barrel and using solvents will only remove this desirable wax coating."
Originally Posted by rcairflr
So for us ignorant folk who clean their barrels each time we use our .22 firearms:
Please explain to me how using a carbon fiber cleaning rod, with a plastic tip and cloth patches will wear out my barrel made of very hard steel.
Well (and this only applies to you "ignorant folks" - everyone else can ignore this) it's easy enough. It's all that pure ignorance energy. It's powerful stuff. Sometimes it can work to your favor but usually it doesn't. So be careful about being so ignorant while cleaning your bore. You could rip right through the side using a toothpick too hard if you aren't careful. Again, it's the ignorance.
Of course I realize that the non-ignorant out there know that it's really hard to wear out a barrel with a nylon brush and a carbon fiber rod. It's the people using hard steel rods and stainless steel brushes all hooked up to a high speed drill that really wear out their barrels quick. And believe it or not I have seen people do exactly that. But since you're ignorant and all you won't need to worry about this. It's different for you. Watch out for those toothpicks. Even touching the barrel with one that happens to be hanging out of your mouth while you're shooting can spell instant disaster for your barrel. Why it's liable to blow right up in your face if you do that!