600 mm x barrel 22 caliber

[douger]

just wondering what speeds you guys are getting good results with 18 jsb or 16 jsb

 

[JCD]

Don't have a speed to suggest by pellet but my .22 impact shoots better with higher speeds (just like most FX's I've touched). I've tried to get most FX's that I've had to shoot at around 12 or less FPE and have failed. Regardless of Smooth Twist or Smooth Twixt ,X pellet weight or even caliber, 860 - 950 FPS seems to be the range the barrels are happy with, Same is true with my ST 600mm .25 and STX 700MM .25.

 

[Bob_O]

925fps with 18gr is very accurate from my Crown with 500mm X liner.

 

[douger]

thank you bob