Quote Originally Posted by DCL_dave View Post
Thanks BTDT, I do not understand the maths involved but the Titan No.8 spring has an OD 20mm, not 20.8mm...


Think I may have given the wrong impression here... the shot cycle/recoil is snappy but not uncontrollable (never said it was!), I can hold a 1" group at 25m and was hitting knockdowns out to 40m with regularity today at the club, even hit the 55y spinners a couple of times (off the bench).


As stated the shot cycle is snappy, I would liken it to that of a gas ram (I have owned a few Theobens and HW90s, so speak from experience)


please correct me if I am wrong - the spring has a finite potential... OK, it is still too much in its current configuration, hence the damn thing keeps going hot especially when more preload is added (or too close for comfort anyway) but if I reduce this springs potential energy still further, then introduce more preload to try to balance out the bounce/slam in the shot cycle, I should reach the point where the gun behaves itself and the shoot cycle/recoil is reduced?...am I wrong?

It is what it is...I have this spring to play with so may as well experiment with it for now.
If you were to carry on reducing the number of coils and preloading to suit, you would just increase the spring stiffness and exaggerate the rapid piston acceleration and bounce, and I think you would risk fairly quickly reaching the point at which the spring went solid and the rifle would not cock.