If you think thats good.. You'd be surprised at the speeds I achieved with 3/8 OD X 1/4 ID Latex hose from LOWES it shoots 185 fps with .50 cal lead balls and when I conducted those tests it was 45 degree F weather you can view the results here, its an old blog. http://slingshotforu...tex-tubes-myth/That was quite interesting. I am suprised that you did not get a greater drop in velocity with the cooler temperature. That .50 caliber lead moving at that velocity really packs a punch!
Cheers ....... Charles