At the range today I was freeing up some brass for some new loads. I shot 100 rounds of .44 mag that were 265gr RD PB bullets loaded about 1400 fps both PCed and lubed with Ben's red as well as the lee 310 GC bullets lubed the same.
When I got home and started cleaning my SBH I noticed a smidge of leading just in front of my forcing cone which is normal for me (literally 2 spots about the size of a pencil lead) I also noticed streaks in the last inch or so of my barrel, this is new to me.
I dipped my brush in my #9 and ran it down the bore. After only a few strokes I was baffled to see these streaks comming out with nearly no effort and in the form of "dust" in the #9 comming out of the barrel.
When I ran my patch down it came out looking like the rag when you wipe the dipstick off after checking the fluid on a bad transmission (black with glitter) A little more effort and I got the leading out at the in front of the cone.
All and all less then 15 minutes and I was done but what was this "powdered lead" caused from?