I'm with you on that question ...
In my view, the Red Wolf and Air Wolf have the highest efficiency, the Harper valve equipped 177 and lower powered 22s are next, then the older valves, THEN the Ghost/Delta valves. It seems that DS are using a Ghost valve or at least based on it on the Blackwolf, but I've not had one in hand. Even in the Delta, (no hammer bounce issue) the efficiency is unimpressive but the valve brings other things to the table.
This assumes that the Harper is adjusted properly, which is often not the case...
Interesting that you want to put a Harper in your 25 as this is DEFINITELY where they don't shine. I would think finding a spring of the right size that you can cut for no preload would be easier and more appropriate ...
In my experience , much above 30 ft lb the Harper starts to lose it's advantage.
Bob
Interesting - perhaps I’ll stick with the stock hammer in my Renegade HP…
Factory unregulated tune it was a beast 895 to 932 to 895 over 30 shots with 34g.
I installed a lighter hammer spring and got a nice unregulated string over 40+ shots - power peaking about 165-170 bar.
Then I installed a Huma reg (still using my lighter spring) and dialed it at say 162 bar and it shoots 25.4g JSB at 925-930; 30g JTS at 880 and 34g JSB at 840… Damn happy with that. 1st spring I tried (sometimes you get lucky, lol), but I have a lot of experience on other Daystates and a small mountain of 18mm springs of various wire thicknesses and lengths.
My .25 rifle has a damn accurate barrel, the electronic trigger on the Renegade is excellent for my target work, but even with the lighter hammer spring I can feel some harshness in the shot cycle from the hammer strike…. this is what I thought I could improve with the slingshot hammer.
I’ve even thought about swapping the barrel and probe on my .25 Renegade HP and .22 Wolverine R HP. This would put the .22 on the Renegade with the smaller air cylinder and the .25 on the Wolverine which now has a 580cc bottle. I’d still have the same thought of putting a SSH in the Wolverine if converted to .25.
As I’m just target shooting, I don’t need/want high power to punch paper, but I do like the HP Daystate barrels as they are polygonal and seem to shoot a variety of pellet weights well.
One other feature that draws me to the SSH is the adjustable length of throw to tweak velocity, rather than shimming the hammer spring (I’ve got 1mm and .5mm washers that fit perfectly on my spring “top hat” guides that allow very precise shimming).
Any thoughts on either what to expect from using a SSH on .25 Renegade or even thoughts on swapping calibers across Wolfie and Renegade?
-Ed
-Ed