I'm going to deviate from the consensus in saying that you've probably got a number factors contributing to the 'high' readings.
First, I'll venture that the chronograph is giving erroneous readings.
I've seen this with my Chrony brand chronograph and my Savage .300 RUM.
I have to set it out past 30' to get accurate readings. With 100.0gr of Retumbo under a 180gr bullets, there is a LOT of muzzle blast! I know that with nominal loadings of a .22-250 and 40gr bullets that it's "close" on accuacy to over 4,000fps. Just not unless the screens/unit is further away with the "cannon".
Second, you are running high pressures as well, as others have stated. A "fast" barrel usually is accompanied by a "tight" chamber. As with the above mentioned Savage, it has a 26" bbl, and had "issues" due to abuse by previous owner not knowing that the extractor was factory installed backwards and using a steel rod of some description to drive the cases out. I had to polished some nasty gouges out of the chamber, and now have a very smooth chamber that dosen't show the usual pressure marks except for the "burnishing"of the case heads.
This rifle, too, "peaks" on pressures before max loads are reached. The above mentioned load of Retumbo is 1.0gr below the book max loads, but is "OVER MAX" in my rifle. I know, because the chrono still says high 3,300 to 3,400fps which is about 100fps faster than it should be. Everything is "about right" at 98.0gr for 3,200fps which duplicates factory ammo. It sure does shoot good groups with the 100.0gr load though. I plan on rechecking it when the temps cool down, as the above data was derived with temps in the high 80's to mid 90's (in the shade!).
So, do as others have suggested and back it down a bit.
In the last dozen or so years, I've seen more rifles "peak" before listed max's are reached than in the previous 30yrs. The tighter tolerances allowed by latest manufacturing techniques is the reason I believe this is happening.
Tread carefully.