lets take an example...
gun weight - 8.5lbs
bullet weight - 150gr
powder - 75gr of XYZ
muzzle velocity - 3100fps
barrel length - 24"
The above produces 19.2 ft-lbs of recoil.
NOW! Change only the barrel length to 30" and figure you gain another 300fps to 3400!!
(and just figure the extra 6" of barrel didn't add any weight to the
Do we have more recoil due to the gain velocity from the longer barrel?