I don't know about the decimal points. I always round everything to the nearest whole number*. Likely was 156.7. It rings a bell.
Edit: If you mean reliable in terms of trusting what the gun was saying, I reckon it was, at least as far as IPL speeds can be. They normally feel inflated by a couple of kms in relation to RSA speed guns to me. That looked about as fast as I have ever seen him bowl, and was a smidge faster than I ever remember seeing him being clocked in RSA.
These lists are very incomplete in general. I have seen a number of bowlers clock faster than the stuff that appears on some of them.
*Except for one Pollock over in around 1999, when every single ball was 144.X, and the consistency was more interesting than the nearest number.
Ok I'm convinced. It was that I saw a lot of sources that showed 154.4 kmph as his fastest ball in his career, so It made me think the former one was speculation.
Fastest deliveries in IPL history:-
Shaun Tait= 157.71 kmph (vs Dehli Daredevils in 2011)
Lockie Ferguson= 157.3 kmph (vs Rajasthan Royals in IPL 2022 Final)
Umran Malik= 157.0 kmph (vs Dehli Capitals in IPL 2022; match no.50)
Mayank Yadav= 156.7 kmph (vs Royal Challengers Bangalore in 2024)
Dale Steyn= 156.7 kmph (vs Kolkata Knight Riders in 2010)
Anrich Nortje= 156.22 kmph (vs Rajasthan Royals in 2020)
Umran Malik= 156 kmph (vs Dehli Capitals in 2022)
Mayank Yadav= 155.8 kmph (vs Punjab Kings in 2024)
Anrich Nortje= 155.21 kmph (vs Rajasthan Royals in 2020)
Mayank Yadav= 155.2 kmph (vs RCB in IPL 2024)
Umran Malik=154.8 kmph (vs Dehli Capitals in IPL 2022; match no.65)
Mayank Yadav= 154.8 kmph (vs RCB in IPL 2024)
Anrich Nortje= 154.74 kmph (vs Rajasthan Royals in 2020)
Dale Steyn= 154.4 kmph (vs Rajasthan Royals in 2012)
Lockie Ferguson= 154.4 kmph
Kagiso Rabada= 154.23 kmph (in IPL 2019)
Anrich Nortje= 154.21 kmph (in IPL 2020)
Lockie Ferguson= 154.1 kmph (vs Gujrat Titans in 2023)
Umran Malik= 154 kmph ( match no.46; CSK vs SRH; IPL 2022)
Kagiso Rabada= 153.91 kmph (in IPL 2019)
Lockie Ferguson= 153.9 kmph (match no.29; CSK vs GT; IPL 2022)
Mayank Yadav= 153.9 kmph (vs PBKS in IPL 2024)
Lockie Ferguson= 153.84 kmph (in IPL 2020)
Anrich Nortje= 153.72 kmph (in IPL 2020)
Jofra Archer= 153.62 kmph (in IPL 2020)
Pat Cummins= 153.56 kmph (in IPL 2017)
Lockie Ferguson= 153.5 kmph (match no.51; MI vs GT; IPL 2022)
Kagiso Rabada= 153.5 kmph (in IPL 2019)
Kagiso Rabada= 153.45 kmph (in IPL 2019)
Mayank Yadav= 153.4 kmph (vs PBKS in IPL 2024)
Jofra Archer= 153.36 kmph (in IPL 2020)
Umran Malik= 153.3 kmph (match no. 21; GT vs SRH; IPL 2022)
Jofra Archer= 153.23 kmph (in IPL 2020)
Mayank Yadav= 153.2 kmph (vs RCB in IPL 2024
Jofra Archer= 153.13 kmph (in IPL 2020)
Umran Malik= 153.1 kmph (match no.17; CSK vs SRH; IPL 2022)
Mayank Yadav= 153 kmph (vs PBKS in IPL 2024)
Nandre Burger= 153 kmph (vs DC in IPL 2024)
Umran Malik= 152.95 kmph (in IPL 2021)
(Some other might exist, as it's almost impossible to find all of them)
Another question, did Rauf bowl 159 kmph in the T20 world cup?