The folks above have it right.
If you have worked up a good load, or have some factory ammo that shoots well in your rifle, here's what you should do:
1. Take it to the range; while you're there, clean it VERY well, especially the bore. I recommend and use Sweet's 7.62; after all copper fouling is removed, I neutralize it with one patch dampened with Kroil; two dry patches, then Hoppe's until it's clean.
2. Now, shoot to your heart's content. Don't hotrod it--1-3 minutes between shots, and 5 minutes between groups. Let it cool sitting upright in a rack with the bolt open.
3. Clean it again, same way as before.
4. Now, fire 3-5 rounds of your chosen ammunition. Do NOT clean it, but let it cool COMPLETELY. A can of canned air will speed the process up, but still wait for at least 30 minutes.
5. Now, take a single shot at a distinct target--I use B27 repair centers. Note well the point of impact on the target, and keep a log of the result.
This is your cold-bore shot; it's where your first shot will go.