Had a range session today with the new .36 UH and squeezed out a .5" group at 25 yds using .19 ticking on hornady ball and 30 gr of Goex fff. Got home and went to cleaning. washed the barrel with vinegar, washed with cold distilled water and voila! spotless squeaky clean Oh! whats that? It's rust! That's right instant rust, it's enough to make a preacher cuss. Squeeged the barrel with alcohol and it went away quickly, followed with Ballistol and the situation stabilized. Emergency averted. Seriously I didn't think rust could form so fast. It was literally in seconds. I used to use hot soapy water wash and hotwater rinse on another rifle and never saw this happen. Is this related to the raw metal after the vinegar cleaning? What gives?