Ah yes I know that spring
Bill,
I fitted a 0.22" Wonky Donky service kit into my 0.177" HW99S, and it made ca. 10.0 ft.lb, with no compression washers fitted.
Lovely to shoot, and much easier to cock that when the rifle is at ca. 11 ft.lb.
Compare the trajectories of 10 ft.lb, and 11.5 ft.lb in Chairgun, and you see you are losing virtually no trajectory with 10 ft.lb
Have fun
Best regards
Russ
Shortening a spring increases stiffness so not the ideal way to go. If Konceptus starts trading again their springs are very nice - softer than standard. My Konceptus kitted 99 is excellent.
For a meteor spring use an early mark of meteor and original equipment...
Titan meteor spring is no. 5. I have used these in some guns but wouldn't say they were particularly soft. The spring in my HW50 is an old one out of my 22 95. Produces 11 in 22. TX mk3 springs are quite weedy so may be worth a look to see if they would fit.
Plinkerer and Tinkerer
I have no idea of what preload the full TX200 Mk.3 spring would give but, with just 71mm of stroke, it would make so little energy available to the piston that muzzle energy will be low, somewhere in the region of (in round figures) 6 ft. lb. from 25mm preload, 7 ft. lb. from 30mm p/l. and 8 ft. lb. from 40mm p/l, quite possibly less.
Oh well, give that one a miss then!! I recently fitted guides and top hat to a 99 in 177 using the std spring and it did just over 11. The pre-load was slightly increased due to the addition of the top hat and slip washer. As you would expect it was snappier than my own 22 version but I preferred it to my 177 95 which will be short stroked by 10mm at some point.
Plinkerer and Tinkerer