Does barrel length make a speed difference?

Does barrel length make a speed difference?

Ever wondered if a longer barrel is better? Faster? More accurate? Well I get to test the theory in this video today, I recently acquired a .177 COmpact FX with a 500mm barrel, I also have the 600mm barrel. TIme to test.

Latest tests:
Copper versus lead 60m test https://youtu.be/F93XGWLbH08
Bent skirts: https://youtu.be/yG4Tl7NWlZw
JSB Polymag test https://youtu.be/gIZf8AQLK7A
Copper versus lead versus lead free https://youtu.be/oeAhVTKzub4
H&N 25gr slugs optimal speed https://youtu.be/Aje6O-Vqbtk
H&N 27gr slugs optimal Speed https://youtu.be/VJqB0exFQq0
H&N 30gr slugs optimal speed https://youtu.be/6yUP7-G2Ons
Hunting pellets .22 at 60m test https://youtu.be/hnHHUNhuJh4
High Power pellet test .22 60m https://youtu.be/GUIwmFUpk7w
Light weight slug .22 https://youtu.be/7NXbMOCwp1g
Pest Control: Hunting pellet or normal pellet https://youtu.be/8s7Fm4K7P5U
.22 Hunting pellets optimal speed https://youtu.be/MCZjYM5Yolo
.22 Ultimate speed for accuracy https://youtu.be/M7TN0jcXdSU
JSB and AA test and conclusion 50m https://youtu.be/IJALAw6ApDA
H&N 50m accuracy tests sub 12ft.lb https://youtu.be/k1-5AjA3klY