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In one very limited test, we shot three loaded with 92 grs at 98 degrees F. then followed up with three of the same which had been put into a cooler and brought down to 60 degrees. The net finding was about 250 fps of velocity loss for the colder ones.
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This is quite a bit differant from what I found. Granted, I was using a barrel within a stable temp range and these tests were NOT done with a fridged barrel. I dont know if that makes a differance or not.
Here is what I found:
104 grains of US869 under a 180 ACCUBOND. Powder temp around 67 degrees vs. the same except the powder temp was -7 degrees. The differance was right at about 120 FPS. Thats for 74 degrees of differance.
95 grains of H50BMG in the same scenario was about 74 FPS.
For all of you that hate the RL line, the colder one was faster by 33 FPS! Dont ask me why.
There was one other post here that had similar results.