Tuning 24 inch barrel for Condor SS

[Iver]

I have a Condor SS in 25 cal with an 18" barrel but I am thinking about changing to a 24" barrel. My question is how much increase in velocity and horse power can I expect to gain? I don't need to know specific numbers but a percentage would be good enough. I have a rat problem that I am having a hard time with. They are getting very smart and I need to get more distance so they don't spook so easily.

 

[Airgunmann]

Probably around 75 fps

 

[Senor Ramon]

I have a Condor SS in 25 cal with an 18" barrel but I am thinking about changing to a 24" barrel. My question is how much increase in velocity and horse power can I expect to gain? I don't need to know specific numbers but a percentage would be good enough. I have a rat problem that I am having a hard time with. They are getting very smart and I need to get more distance so they don't spook so easily.

I think Airgunmann is correct. I did something similar. I took my Talon SS 12" 0.25 barrel and swapped it for a 24" 0.22 barrel. I saw an increase of about 15 FPS for every inch added. I went from 650 FPS with 0.25 cal. JSB25 grains to 850 FPS with a 0.22 cal 14.66 grain H&N FTT pellets. I have the stock valve (not hi-flow).