I am experiencing excessive fouling in several rifles. One is a stock 700 VLS in 260, one is a custom with Krieger barrel in 280 Ackley, and the last is a Shilen barrel in 6.5-06. Even when shooting only 5 rounds, after a few patches to get the powder residue out, you can see that the lands are completely full of copper. It does come out, but requires a fair amount of brushing with JB's or Bore Shine. The bullets I shoot are mainly Mach Kings but also shoot some Ballistic Tips. The only common thread among these barrels is that they are all chromoly. The 2 custom barrels both have over 100 rounds and the Rem. has over 1,000. It's a real pain in the neck to gather this much copper and spend all the time cleaning. My other rifles can shoot 20 rounds of the exact same bullets and not get any copper whatsoever. Are the MK's known for leaving copper or am I just unlucky. Possibly I didn't break the barrels in correctly although they were cleaned after each shot for the first 10 to 20 rounds or so. Any suggestions would be appreciated.