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Bianchi, Good advise is posted above but first and foremost your chrono is not their chrono! Your chrono can be a very useful tool for you if you understand a few things.
Given the short screen placements and non repeatability of this setting on hobby chronos you will have some variations. Most of the test data you see has been fired from test barrels that may be longer and tighter than yours.
Do this. Purchase a round with a published velocity that you find in a reloading manual or article and fire it over your rig. Make notes. Make detents, drill holes, take measuring tapes etc. to insure that you set up your chrono exactly the same way and the same distance each and every time and Make notes. Evaluate your loads as to accuracy given the muzzel velocity as shown by your setup and don't worry about what West Simpelton says he did with his 398 Bouywhacker at 1400 yds.
It's a useful tool for me. Your velocities will be your's. Simple enough huh?
Best regards and good and safe shooting
Hank
Others here can explain scientific notation and Occam's Razor "?" etc. just be careful and enjoy
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