HW/Weihrauch Anyone know of a high output tune for HW95/R9 (18-20 FPE)

[A.G.R]

My HW80 is one of the few springers I have that really NEEDS a full blown artillery hold by the books. These were JSB 10.3s. H&N 10.65 pellets are a good 75fps slower

View attachment 434081

What in the hell spring set up are you using and it must be crippler on the arm as the short stroke and a bit longer breech block don’t lend it to the golden ratio of cocking. That being said ,some guns are just overachievers.

I have tested .22 with every major kit out. Excluding older Venom and Tinbaum. .
Macarri, newest power kit.142x 865 ..Vortek, both versions.. The older 148 x 865 pg3 and the newer148x 905 and without port work and the proper fitting seal were snap chatters. I actually just did a Macarri spring and my own top hat as well as ported it to 3.4 mm and it’s delightful at 875 with 14.66 Ftt.
The most powerful .22 I have put together uses a .135 wire. Breeze to cock.

 

[Sqwirl57]

What in the hell spring set up are you using and it must be crippler on the arm as the short stroke and a bit longer breech block don’t lend it to the golden ratio of cocking. That being said ,some guns are just overachievers.

I have tested .22 with every major kit out. Excluding older Venom and Tinbaum. .
Macarri, newest power kit.142x 865 ..Vortek, both versions.. The older 148 x 865 pg3 and the newer148x 905 and without port work and the proper fitting seal were snap chatters. I actually just did a Macarri spring and my own top hat as well as ported it to 3.4 mm and it’s delightful at 875 with 14.66 Ftt.
The most powerful .22 I have put together uses a .135 wire. Breeze to cock.

I have no idea. This is one of the few springers that I own that I haven't done anything to myself. I picked it up through the classifieds for like $300 assuming something had to be wrong with it. Nope. Just a basically brand new tuned HW80SL with what looks like a Venom muzzle brake for $300

One day I'll get bored and tear it down and take some measurements but until that day comes its a mystery to me.

 

[bf1956]

That's correct. 177 is not efficient. It's why I'd recommend going to 22 if you want manageable power from that platform.

How about .25?

 

[Mycapt65]

How about .25?

I'm not sure about 25. I don't have one. As bore diameter increases efficiency increases. Logic would dictate that 25 should make more power and be smoother than 22. However the few people that have converted there 80s to 25 from 22 have reported a power drop of about one pound. I'm not sure what the reason might be but it might be 25 pushes past an efficiency threshold. Again I can't confirm it but believe the sources. There's guys here with the same guns in 22 and 25 hopefully they can supply you with actual data from personal experience.

A side note. Just be aware a 25 caliber Hw80 would be very looopy. If you're OK with that, you're good. I couldn't do it. I like my guns to shoot >700 fps. I suspect a 25 cal 80 would be <600 fps.

 

[Sawney Bean]

I’d personally look at getting a Diana 48/52/54 or maybe a 350 Magnum.

 

[Deerstalker]

This data may help.

HW95L Specifications:

HW95L

26 Bore Diameter Piston Seal Size (mm)

85 Piston Stroke (mm)

45.13 Piston Swept Volume (cc)

3x15 Transfer Port x Length (mm)

0.106 Transfer Port Volume (cc)

426:1 SCR

254 Piston Weight in Grams (g)

SCR = Static Compression Ratio, has little to no meaning for a pellet rifle.

Pellet Rifle Swept Volume formula: Rifle bore radius squared x Pi (3.14159) x piston stroke = cubed mm. Convert to cubed centimeter by moving decimal point 3 positions left.

Example: HW95L .22 caliber 26 mm Bore radius = 13 squared (1/2 diameter) = 169 mm x Pi (3.14159) = 530.929 x HW95L Stroke 85 = 45,128.9 mm cubed. Convert to CC (cubic centimeter) = 45.128 or 45.13 CC for Swept Volume.

Also:

FPS = Feet Per Second, MPS = Meters Per Second, FPE = Foot Pounds of Energy.
To convert to Joules multiply FPE by 1.3558, Joules to FPE multiply by .7376
To convert MPS to FPS, MPS x 3.2808399 = FPS .
To convert FPS to MPS, FPS x .3048 = MPS.
FPE Formula is Pellet weight (gr) x FPS x FPS divided by 450240 or 450436.7.
450240 is 2 x velocity of gravity x 7000, (2 x 32.16 x 7000 = 450240)
450436.7 is 2 x velocity of gravity x 7000, (2 x 32.17405 x 7000 = 450436.7)
The constant 450240 or 450436.7 depends on which value you use for the velocity of gravity.
32.16 ft/s/s or 32.17405 ft/s/s. There are 7000 grains in one pound.
The difference does not matter which ever constant is used for the FPE calculation.