We will have to agree to disagree. My method has worked for meBy degreasing the bore as you say, what do you think happens when that first bullet goes down the bbl? Copper fouling starts and builds up fast.
for many years. I don't have any copper problems in any of my
wild catted 7mm's pushing a minimum of 2800 and high's of
2930 fps. Barrels are Bartlein and Brux. Currently also playing
with a button barrel, Stan Taylor did for me for a bench rifle.
After 400 rounds, Sweet's says it's good to go.