"Bray Haven" wrote in message
...
Get yourself a bottle
of Hoppes #9, plug the chamber, fill to the muzzle with Hoppes, and
leave over night.

I've found shooters choice works much better. Use it all the time (I'm a
gunsmith).

Yeah, I've compared Hoppe's copper-removal formula (the heavy-duty version
of No. 9) and Shooter's Choice, and the latter worked better for me on
copper fouling.

Ed Huntress