This old Douglas barrel has minor fire cracking for 12", thus this gives the powder something to adhere to. I went at it again with a vengeance today. The barrel had been soaking for 24 hours in Montana Extreme bore solvent. Patched it out, then bore scoped, and this did nothing for that cooked on powder fouling.
Next, I used a bronze bristle brush, applied JB, brushed till the brush wore out, which took about 20 strokes. Bore scoped the barrel, and this got a bunch of powder fouling out. Still some left, then repeated the same with 10 more strokes, The barrel looked pretty good at this point.
Now that I have it down to bare metal, will be interesting to see what the pure Wipe accelerator with foam will do with just soaking. The Wipe out and accelerator worked like a charm on my SS 270 after 70 shots, but the barrel is in pristine condition.
Also, will have to add some KG1 on the Midway "Cart" to try.
Here is my conclusion so far, the Wipe out will work well under normal conditions. Wipe out did get all the copper out of this barrel on the first soaking. When bores are neglected or bores are in rough shape, this is when you need to use other methods. I had been giving this old Douglas barrel about 5 strokes with a brush, then Montana Extreme Copper Killer, and never scoped the bore...boy, what a mistake that was. Brushing with JB is an extreme Cure to remove the powder fouling, and obviously my 5 stroke brushing with regular bore solvent was not good enough over the past year, with about 70 rounds on the bore in between cleanings. This powder fouling is obviously an accumulation over hundreds of rounds and incomplete cleanings.
This old Douglas barrel will shoot less than 1/2" groups at 200 yards with many loads, amazing considering just how rough the bore is.
I am thankful to have good ole JB, and there is no evidence of scratches in the bore from brushing with JB, you just wear out a new brush real quick. That Lyman Bore scope with it's 25x magnification lets you see everything up close and personal right on that little TV screen, best $180 I have ever spent.