Depends on the bore, the bullet jacket material, bullet bearing surface area and the velocity. The rougher the bore the more copper fouling. Mass production barrels tend not to have the level of care and attention to detail the small custom barrel makers have, and generally have rougher bores.

The jacket material matters too. Some bullet jackets are made of pure copper, which is very soft and wipes off fairly easily compared to the more typical guilding metal (copper with about 5% zinc), which is much harder and usually fould less.

Bearing surface is another factor. Bullets with more bearing surface against the bore will have more opportunity to shed copper than a shorter bullet.

Lastly, and probably most influentially, is velocity. The faster the bullet moves down the bore, the more friction and heat is created, and the more copper tends to get soft and rub off.

Only way to know is to shoot it and observe for copper buildup. One word to the wise; just because you can see or detect (via copper solvent returning a blue/green patch), doesn't mean that there is something drastically wrong. If the gun shoot well with a little copper in it, don't sweat it. Some rifle like it that way since the copper smooths the bore out. if you get carried away with cleaning out every trace of copper, you might just scrub away your rifles accuracy with it. If you see a lot of copper buildup and/or accuracy starts to deteriorate, then it's time to break out the old Sweets 7.62 or Barnes CR-10 and get the copper out.

Just see how the rifle shoots. Also be aware that some guns won't tolerate much copper at all. My Ruger M77MkII V/T .22-250 liked being cleaned about every 10 shots or so and was a tack driver as long as it was moderately clean. My Remington VLS likes being dirty and if I clean it with more than just a light powder solvent and a couple patches, it'll shoot all over the place until it gets 10-15 shots through it to get it nice and dirty. My Savage doesn't care one way or the other. Rifles are all unique. You just have to find out what your rifle's quirks are.

Good luck,

Mike