Iron,
Hoppes #9 does not really deal with copper fouling. And, it sounds like you have a bit of a rough bore. Did your groups begin to shrink as you fired more rounds? I bet they did.
As to cleaning, this is voodoo, everyone has an opinion. You'll get rid of the copper fouling (aka the blue stuff) by either friction, or chemically. If friction is the way you wish to go, you'll need an undersized NYLON brush with REMCLEAN on a patch, several strokes per shot fired....many variations of this out there.
If chemical is the way you decide, then something like Sweet's, Shooter Choice, etc., on a patch, let it soak (barrel angled down don't let this drip back into your action) per manuf instructions.......then use a NYLON brush on it, followed by the Hoppes and dry patches.
Me? Well, I got tired of spending money on the above chemicals, so I use a bore guide, one piece rod, NYLON brush, and being careful, ammonia from the store. Don't leave this in there longer than a few minutes, brush, then use patches and Hoppes.
Good luck
RR