Here's the reason I break in. I rarely if ever see it do miracles as far as fouling. But I am in a hurry. I have accomplished the same thing shooting like 200 rounds. Some guns after 200 rounds, they chronograph alot better with alot lower spreads, and they seem to throw less flyers. Also a gun is dynamic. You can make a load for a gun when it was new, and all the sudden, you see accuracy changing. So I cut to the chase. If I shoot, decopper, shoot, decopper, for 20 rounds, for me its like going to the range with 10 box's of shells, 10 times, with 10 cleanings in between. I then can get to some serious load development. If the gun still fouls badly or has a tendency to throw flyers, probably just a rough bore.

If a gun shoots awesome out of the box, I hesitate on whether or not mess with it.

For instance, I got a 460 pistol a few months ago from the performance center is just awesome in accuracy. It doesn't foul badly, so I didn't bother with break in.

You know break in is working if lets say, you shoot one shot and clean out the copper, and do that until the point, where you see little to no copper come out, and then move to 3 shots and clean, you do that until you see little to no copper come out, and then move to 5 shots, and then 10 shots. If you see 10 shots with little to no copper, then you got one smooth barrel, no need to go further. I got a sako 75 a few years ago that this worked great. But its a rarity.