My paint held up fine, and I was overboring by 1-2 thousandths. The paint shot great, after a move it would shoot a lot like I had a break for the first 4-5 shots. I inspected my barrel, and it was entirely due to condensation/snow getting directly into the bore.
My paint was stored in the heated shed at my field, it wasnt ever colder than 70 F until I walked onto the field. I was using a hopper with a lid. I was using winter blend paint. I always turn down my velocity in the cold, I was shooting in the mid to low 260s.
even at the end of 20+ minute games my paint shot straight after a few clearing shots or a quick swab.