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If you are really thinking about precision shooting with a clean barrel, then you should probably clean the barrel between each shot of a group. That should make waiting between shots an irrelevant issue.
Of course, then your gun is essentially a single-shot.
Most people shoot fouling shoots before shooting for group, and then also shoot a fouling shot or two before they hunt. That way, the second shot is more likely to go where the first shot went.
As for how long to wait, why not test that in YOUR rifle with YOUR ammo by shooting about as fast as you can aim precisely at a series of bullseyes, so that you can see which rounds start to widen your group. Then, try shooting slower until the group does not open up at the same shot number.
Of course, your results will depend on ambient temperature, as well as your barrel weight, bedding job, load intensity, etc.
SL1
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