I appreciate the expertise of azguy and charlie b and believe they are both right.
I find that shooting from a recently cleaned barrel results in one or more rounds off the POI.
Then after the cleaning residue is eliminated, the POI is right on and the rifle is back to its normal accuracy.
Most of my rifles shoot the first round or three high then the POI drops to the POA.
I have one rifle that does the opposite - go figure.
As I said, I generally shoot 75 to 100 rounds with each rifle I bring to the range on any given day.
With that amount of use, I am a great believer in cleaning rifles after every use and removing copper. I never use a brass brush and rarely use a nylon brush.
Because I clean each barrel so often, I use either Wipe-out foam or Patch-out fluid on a patch because they are not harsh but take out the copper very effectively while they clean the barrel.
I only use the foam on higher calibers because I find that the nozzle on the foam doesn't make a good connection to the chamber on calibers under .308 and often foam comes back into the action.
But the foam does wonders cleaning out flash hiders and muzzle brakes on my .308s.
The first patch through the barrel after putting the foam or fluid into the barrel and waiting at least an hour comes our deep blue from the copper removed.
The barrels are clean - nothing showing on the patch - after about 8 to 10 patches depending on the number of shots fired.
As for barrel wear, I have over 4100 rounds through my best shooting Savage 6.5mm Creedmoor and 3600 and 3900 respectively through my to .308 Savages without any drop off in accuracy. In fact, over the last three years each of the three rifles have shot more accurately every year, probably because I concentrated on improving my shooting and reloading techniques for the past three years.
I admit that I did wear out my first Savage .308 after over 6,500 rounds but that was primarily because the chamber that came from the factory at 0.080 longer than SAAMI.
The 6.500 rounds eroded the chamber another 0.090 deeper and I had finally had to seat out so far to maintain the jump to the rifling that I was losing consistent neck tension.
All of my new Savages have come from the factory with chambers right at SAAMI so I figure I may have an extra 5,000 rounds of erosion available to wear before I have to replace those barrels.