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You can get a lot of pressure and velocity change with temp increases. I had some .50 cal loads that were just fine in the winter running about 2950fps through my friends bolt action .50. Temps were in the 30's and 40's at that time. During the next summer the same ammo was running over 3100fps and showing signs of high pressure. The temps at that time were in the high 80's. This was with the same ammo loaded at the same time.
I don't think 200 fps for a heat soaked round is unbelieveable and I'm sure it depends on how much temp rise the round actually saw. You may have actually hit the point where the barrel temp was ideal too....many factors in play.
Frank
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Threaded Mode