Quote Originally Posted by Snooper601 View Post
As promied, the measurements from a recent SFS HW95K
SFS spring HW 95K

30 active coils
3.46mm wire
3.95mm gaps
19.75mm o/d
13mm I/d
223mm free length
16mm preload gave 790fps with 8.4gn .177 JSB

Cheers

John
Excellent info, John.