All of the bore cleaning products that I purchased locally were not doing much to remove the copper fouling in my custom made 204 Ruger Savage Heavy Varmint rifle that I built, and the size of my groups had become unacceptable. I've finally found a copper remover that works – KG 12 Copper Solvent, which I ordered from MidwayUSA after reading many reviews.


Here are three of the tightest groups out of eight that I shot after using the KG 12. I was using new (never fired) Nosler cases, and the wind was gusting to 15 MPH.


Side note: I also tried Nosler cases for my 6.5 Creedmoor, and found that the majority of the primer pockets were loose after being fired once. Hopefully, these 204 Ruger Nosler cases won't suffer that problem when reloaded. Anyone else having problems with Nosler cases?