Re: copper fouling
My brother's old Rem700 30-06 will shoot sub moa with bare 180 gr bullets, and then after 6 shots, the groups get to a few inches.
It then looks like there is a lot of Copper in the muzzle, and it takes me 30 minutes of KG-12, Flitz and Kroil, KG-12, Flitz and Kroil, to get it out.
Or my brother can put in Hoppe's #9, wait 24 hours, put in Hoppe's #9, wait 24 hours, Put in Hoppe's #9 wait 24 hours, etc until the Copper is gone.
When I take 4 different 7mmRemMag rifles with Copper free bores to the range at the same time with the same ammo, all 4 Copper foul at different rates.