Hello to All,
I use the below trio of HWs in the MPL :
HW30S - Vortek PG2 kit 7.8 ft.lb with JSB Express (7.87 gr.), 3mm post front site, Gehmann 590 rear-sight, Anschutz 9775 0.5 --> 3 aperture.
HW99S - Full Shauny tune - 11.1 ft.lb with JSB Express (7.87 gr.), 3mm post front site, Gehmann 590 rear-sight, Anschutz 9775 0.5 --> 3 aperture.
HW95 Super Match - Wonky Donky Extreme short-stroke tune - 8.7 ft.lb with RWS R10 Pistol (6.99 gr.), Centra score front tunnel with 4.6 mm Centra Glass element, Gehmann 590 rear-sight, Anschutz 9775 0.5 --> 3 aperture.
The Gehmann 590s have been drilled & tapped to take a 3 mm screw to act as an arrestor. This is needed as most modern aperture sights do not have the clamping force needed on a recoiling springer.
Serously reducing a springers output, whilst maintaining a fast shot cycle is very, very difficult.
The Wonky Donky extreme short-stroke was the best that could be achieved - seriously lightened piston with bearings, piston extension to short stroke, and a long & soft spring.
The shot cycle is a quick as it was when the rifle made 11 ft.lb. - indeed, the shot cycle of the above rifles are much quicker than on 'traditional' recoiling 10m springers such as the Walther LG55 & LGV.
The experiences reducing the HW95s power, led me to leave the output of the 99S at 11 ft.lb, as the rifle is perfectly balanced at that output.
Have fun & a good weekend
Best regards
Russ