I have seen that rust color before on patches. If you have a clean patch before you apply your gun oil and you make sure to coat it good, that should not happen. Sometimes I get that or a small black circle will appear. The black circle is the jag head picking up oil saturated fouling.

This is only a guess on my part as to the orange patches. I sometimes think that the oils we use to preserve our barrels leach out from the pores, scratches, and any crevice or deformity, all the tiny particles of fouling that we somehow miss in the clean process. Face it, what's the odds we got every speck of fouling out of the barrels. These gather in the oil and then as the oil drifts downward to the breech it sits there. When we run a patch it picks up the excess oil, now saturated with the fouling specks that may have turned orange, and it comes out with a patch like that. You might notice that a couple more patches after those and they come out clean. Why, because the pool of oil has been removed.

Why do some rifles have this more often then others.. again speculation. But I believe that it is the quality of how well the bore is polished. The better barrels have less deformities, there for they should come cleaner. Also Gander had a good point. Some people use bore conditioners. These bore conditions clean and seal the bore. Which would then inhibit again, these fouling specks from sticking and later flowing with the oil.

I would give that barrel a good JB Bore treatment, and then use a bore sealer like Montana Bore Conditioner and treat the barrel. Even if it don't help, it will not hurt. And again, this is just my opinion. I might be way out in left field on this.