It's a factory 700p 338 LM. I will be rebarreling to a 338 LM AI in the near future. I have not loaded any for it yet. The post your loading bench thread got me to rethink my bench it been a weekend of rebuilding. It should be finished tomorrow. And I can get loading. I appreciate all the responses and opinions. It's only my second NEW riffle all others have been new to me. Just want to make sure I'm doing things right......
So, it is a factory barrel, and probably will copper foul at least for several rounds. Get yourself a good cleaning rod and guide (Dewey is first rate). You have a big bore there, and there is no excuse to damage it, if you take care. Clean after each shot with a good copper solvent containing ammonia (Barnes CR-10 or Sweets 7.62). Use a nylon brush with a white patch wrapped around it. The color of the patch will tell you if you have copper or not. You may very well find the barrel cleans up after just a few rounds. If so, then you are done. If not then you will be in no mans land wondering if it will ever clean up. No mans land is what drives folk to buy custom barrels.
Do the cleaning at the range of course and sight in, and have fun shooting it. Break in does not have to mean wasted shots. A clean barrel will have a different point of impact, but not much and don't worry about that for now.
If you follow this process then you can learn something about the barrel and hopefully you will share it with us. A simple method is to count the blue patches you get after each cleaning, before they start to come out white. You should see a steady reduction in the number required. In my factory Savage, I now see one black one, then a grey with no hint of blue, and then one pretty much white. That is with 50-60 rounds between cleanings.