Spyda .177 slugs.

My wildcat came with the Huma power kit installed,I’m using the lighter of the two heavy hammers.
Reg set at 123bar but velocity’s are all over the place, so I need to systematically work through the “tuning and balance” process.
But this is a .177 slug thread, so Pauly, did u ever get to testing those -13.4gr Spyda slugs in your uragan?
I might put some through my D54 and see how they go.

You need to ballance the hammer weight against the reg pressure so that the hammer isn't hitting too hard, or not hard enough. You can only do this using a chrony.

One way is to start with hammer set low. While recording the speed, increase hammer tension until you notice the pellet speed stops rising and kind of reaches a plateau. at the plateau point you are probably only just past the ballance. You may notice the shot sounds sweeter at this point too.
This doesn't mean it's the best speed for the slug, but it means that at that reg pressure and that hammer setting things are ballanced.

More hammer tension and you waste air. That extra air can upset the slug, so if you want more speed, tweak the reg pressure up a touch and tune hammer again the same way.

That's how I do it, but i'm certainly no wizard and it can get frustrating.
Be prepared to shoot a lot of pellets and go through air.

I’ve just had a similar experiance with H&N FTT pellets.
At 40m they were amazing. 5 shot group was 17mm if I remember correctly.
4 of those were in a 7.8mm group 😳, at 40m! 😳

When I moved back to 80m, the group exploded to about 20cm!!! 😳😳😳

17mm at 40m should give you 40mm or 50mm at 80m.
I have no idea why they went from excellent at 40m to total crap at 80m.

Finally managed to spend some time with these slugs.
Weighed them and they came out at 13.44gr.
Put them over a chrono and my little Elly is pushing them at 638.8 fps.
Unfortunately I think they need to be going at least 50% faster.
13.44gr at 638fps gives 12.17FPE
Shot a group at 20m and got a CTC of 24mm, not quite where it should be 🤔

The guys overseas shooting slugs from 12FPE .177 are shooting 10gr slugs, which I tried very hard to get hold of, but no one in NZ imports them.
These were made for me by Spyda in South Island and this weight 13.44gr is as light as he can make them.
Very keen to see how they perform at 950fps 👍🏻

Dont know where he is based, somewhere in the South Island.