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Theres two things going on here one is as Doc said barrel heating up and allowing faster fps. second is as the powder in the cases reaches ambient temps it will also increase slightly the fps.
How long you leave each round in the chamber will have an effect of fps too.
I don't think that the length of time in the chamber would equate to much as you said you took shots around every 30 seconds or so, this may or may not be enough time for the chamber to warm the powder inside and increase its burn rate. Did you chamber the following round immediately after firing the previous round or used it like a single shot and loaded a round then fired?
I remember a time when I competed at a shooting match where my coach started yelling at me to put rounds down range faster than what I was because the burn rate was being increased due to length of time the case was in the chamber and it was around 30 seconds too, he said I needed to crank one off about ever 10 seconds when the wind was the least amount. Heat will play havoc too as timed shots will allow a more consistent heat soaking for each round.
Come to remember when the wind fell off everyone shot 10 rounds as fast as they could.
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