Re: Copper streaks with new barrel
I use a J. Dewy jag with the patch wrapped around it and saturated with Sweets. It is tighter than other tips and has more surface area also so it works faster right from the start.
If your bore is leaving copper after all day ( a long time stroking ) while using Sweets that bore has got to be WAY, WAY fouled or VERY rough.
JB never worked all that well for me and it seemed like forever getting everything cleaned up after using the stuff anyway. I'd still be using it though had it worked better and faster but it just didn't for me.