Never chronoed it.
The smith that built it, has built many, says its right at the 4000 mark, just under.
However, I was corrected on here by some of the tech guys when I made that proclaimation. So, I dont know for sure. Its fast enough. I can attest to that.
Actually, it shoots great when fire forming. Cant tell alot of difference. Another thing I like is I can shoot the 75gr VMax and the 100gr Partition, and it doesnt change the 0 enough to mess with. Right there.
Andy