Thank you for weighing in... I am certainly not qualified to opine. Most of you guys have a ton more experience than I . But I also have concerns about a brush in the barrel. But I am willing to do what it takes to do this thing right...
I used to use brushes until a friend and mentor introduced me to a product called Accelerator which can be used in conjunction something called Wipeout/Patchout and I've never used a brush in my bores since. They can be mixed in the barrel, but not otherwise. For 25/26 caliber I use a 1 1/8'" "loose" patch and push that thru with Accelerator followed by another loose patch with the Wipeout. Give them about 5 minutes to work and push through a couple"tight" 1 3/4" patches with some rubbing alcohol on them. Repeat a couple more times. At first you will see black until the powder fouling is gone the if there is any copper it will show. My Hart barrels show hardly any copper fouling. I have found that before doing anything else I usually push a few tight patches through with just rubbing alcohol on them to get out most of the powder fouling. Also for whatever reason [thread handedness and twist not working together] my jagcomes loose. If this happens to you, most will say to tighten the jag back up before pulling your rod back out so the gap doesn't catch the muzzle edge and ruin your barrel crown.
Don't know if it matters, but I always use Accelerator first followed by Patchout. The Patchout is the copper remover.
I understand that it used to be common practice to run patches of Ronsonol through your barrel prior to cleaning.