Even though I've always given my Husky .30-06 a once a year treatment of Gunslick foaming bore cleaner it's been rapidly losing accuracy. I'm pretty sure copper fouling is to blame and have been working hard on it for the last three days. I've used up my bottle of the foam and moved on to a half bottle of Hoppes Copper Out. I've finished that off and today bought Shooters Choice Copper Remover. I've used that quite a bit today and still every patch comes out blue and when I look down the barrel I can see the lands are still covered in copper. I'm beginning to wonder if this barrel will ever come clean.
Yo we were just talkin about this at club today. A few guys use the foamin cleaners for copper foulin. They said after the cleanin their rifles shoot big groups but come back after a number of rounds....later
Some guns just aren't easy to clean, especially if no break in was followed and copper was allowed to embed. Right now I have Bore-tech Copper Remover (original and not available anymore), Gunslick Foaming, Barnes CR-10, and Hoppes 9 Copper Solvent. Of these Bore Tech is the best using a borescope for inspection, but unfortunately not available anymore, a newer eco friendly form is available and knowing BoreTech it may be very good but I haven't tried it. If you search you will find some independent tests showing KG-12 as very good. When I go thru my boretech that will be what I try next. http://www.eabco.com/KG12Copper.html
I would forget Hoppes Copper Solvent, as part of an experiment just last week I tried it on a lightly copper fouled 243 and with the bore scope it just wasn't doing anything.
Here is a 270 that I put in the gun safe for about 20 years, I didn't know anything about copper fouling and assumed it was shot out as it's accuracy took a nose dive. I learned about copper and spent 7 days, 3x a day cleaning it, before work, after work, before bed, allowing the boretech to sit in it between each session. After a week the patches were finally coming out mostly clear after sitting for several hours. But still today it loads up with copper real quick in areas in the barrel, much much more than any rifle I have but the accuracy is original again. This is a video after just the grouping shots after the total cleaning. You can see how it fills in the pores and then accumulates onto itself.
Click on pic.
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