Shot the limited nationals in Reno in 92 or 93 was using Win231 for my 45 loads. I was from Cali at the time and before leaving temp was 70 degrees my PF was 185, well 2 days later in Reno about 35 degrees, same load chrono's at 163PF!!
AWLAZS at a major match your loads will be pulled from you and kept by the RO's until it's your time to chrono, they won't let you heat them or do anything with them including
"rolling them in your hands to warm them up", ask me how I know!!