FXImpact .25 velocity

[Shu]

What have you found to be the optimal velocity for the JSB 33.95 MKII in terms of accuracy? 

 

[Centercut]

It really depends on the liner. Pellet A likes about 870 to 875 fps, Superior likes around 900 to 910 fps, and Superior Heavy likes about 930 fps. I'm not sure what the older ST barrels or ST liners like, but probably similar to the Pellet A. All of them prefer the Mk2 except the Slug A which likes the King Heavy Mk1 better at about 905 fps.

 

[cmatera]

What barrel length? My M3 600mm likes 885 fps with the factory shpiied liner.

 

[douger]

start at 870 work your way up shooting groups as you chrony the gun, i bet 920-940 seems like the newer liners like more fps twist rates also matters 

 

[Shu]

Sorry. 700mm FX Superior barrel. No carbon sleeve

TUNE IS: 16 wheel 4 micro Second regulator 115 First factory 170

Bottle valve 4.50 to 4.75 turns out. 

I’m seeing similar results to those just posted. 

 

[2L8]

^^^^ Agree with all the suggestions posted here. Spot on to answer your question.



Patrick