There is an article in the now defunct 'Guns and Game' magazine here in Australia where a well known Australian shooting personality used a .17 Rem improved to crack the 5000fps barrier with one shot, with the rest greater than 4,800fps. From memory he used one of these radar style chronograph so. He used to do some pro-shooting on the side and is not one to be 'all wet'. I'll see if I can find the article.
The is also a fella here in Aus who posted photos of blue beta chrony readings up around 4,900fps from a 17ppc
Marcus
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