I just did a very quick barrel length comparison.
My 25" BSA Sportsman 5 and my 18.5" Henry 001.
Barrel lengths measured with a .20-caliber rod against the bolt face are 640mm (25.2") and 472mm (18.6").
Both rifles would have had a similar amount of ammo through them, the BSA was barely used by a family member who bought it new when he was a kid, the Henry I bought new in March 2018 (but I doubt BSA ever imagined their rifle would ever see 1850fps).
CCI Standard Velocity - https://cci-ammunition.com/products/detail.aspx?use=1&loadNo=0032
CCI Quiet HP - https://cci-ammunition.com/products/detail.aspx?use=1&loadNo=0970
CCI Copper-22 - https://cci-ammunition.com/products/detail.aspx?use=1&loadNo=925CC
These are listed at 1070fps, 710fps, and 1850fps.
Yes, I checked the figures for the Std Vel and both riles totaled identical velocity across five shots!
So, the 25" barrel loses about 30fps over the 18.5" with the low-velocity Quiet.
Both are identical with the Standard Velocity.
But the long barrel gains about 180fps with the Copper.
https://www.youtube.com/watch?v=HjwzxgVKrMU