I know copper fouling helps with keeping groups tight when it's not overly fouled with copper, but what about powder and carbon fouling ?
If I remove the powder and carbon because I need to oil my rifle when hunting in the rain, will this change poi ?

Thanks again for everyone that has been chiming in to my threads !

Should be fine. After EVERY hunt I run a Boresnake through whatever rifle I used that hunt. I bought a snake for every caliber in my 3 dozen+ arsenal (including shotguns as well). If the day included rain, fog, snow etc I'll put a few drops of CLP on the "knot" of the snake where the rope meets the mop. If the weather outside is below 40ish I'll let the rifle warm to room temp & then run a snake in it & wipe the outside off to prevent/remove condensation.

I've shot Barnes bullets for over 2 decades & I'm sure "technically" my rifles are "copper fouled" but they are hunting guns, not paper punchers but I've never "stripped or defouled" the bores. I just keep powder residue & moisture out of them before sticking them back in the safes.

I never hunt with a fresh cleaned, oiled barrel, it definitely changes the cold bore first shot, how much varies from rifle to rifle but its around 1 MOA minimum on average.
RR

10 - 4 thanks!!!!

Do you not worry about rust in wet weather or taking it in and out from warm to cold ?

Clean and oil after the hunt. Before the next hunt, run a couple patches through with alcohol and a couple dry patches.

Stripping a barrel is definitely overrated. A fouled barrel is a more accurate barrel. For long term storage, yes, clean and oil. A hard day in the field, wipe down. If a thorough cleaning is done, a fouling shot or two is definitely needed, or you will not be hitting what you are shooting at.

I go along with Ridge Runner I never run a oiled patch after I sight in my rifle and hunt with it. I don't shoot that many deer in a season to worry about build up. If you feel you need to run a patch thru your rifle then use a dry patch.

Thanks you guys for the info , very helpful.

Fouled barrel during hunting season if longer range shots are expected. Clean barrel the rest of the year.

For deer hunting at closer ranges it will not matter if the barrel is fouled or clean. In that situation I keep them clean.

Barrels that are not properly cleaned and oiled for storage often show the effects eventually with rust and pitting.