Two more Wildcat questions...

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JCD

JCD

Member
Sep 1, 2016
1,072
32
MD, United States
1st - I’m a .177 fan and I have been trying to see if I can get a .177 WC (US Spec) to shoot at lower speeds. It was a complete fail at 11.5 FPE. Inconsistent both on the chrony and the target. I’m up to 14-15 FPE now and its better but still not acceptable. (Attempts have been with both the FX and a HUMA reg). Question is simple, has anyone detuned a .177 WC with success? And I guess the second question is whether or not you’d be willing to discuss here or privately?

2nd - Does anyone know for sure if the MKI and MKII stocks are interchangable? Mine are all MKI but I’m thinking about a changing out one to a MKII, but want to keep the stock I have now (or at least have the option too).
 
Jeff,



Not sure (with the FAC) gun that you will be bale to get it that low without changing the TP or the plenum size. I originally set my Huma at 120 bar. After the reg broke in it settled at 130 and was shooting the 10.34's over 1000fps. I wound up turning the reg to it's lowest setting of 90bar and now it's down to 865 with the 10.34's.

It does put them all in a single hole at 25yds. I don't think the (Huma) FAC regulator is designed to go below 90bar. You would likely need his LOW pressure one. (60-110bar)
 
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Hi Rob.

I got a HUMA reg down to a very consistent 72-73 as measured by a reg tester over and over again.... but chrony results were awful. I was discussing offline with someone and the VS vs TP was were we kept the conversation, there is no room for a meaningfully 'shorter' plenum spacer without covering the vent hole but could take up some of the volume. These are so easy to get apart I just took it back up to 19 FPE with about 100bar from the reg 890-915 FPS with 10.34s Not the flattest spread but I cant really see the diff on target. I'll have to think about more tinkering VS trying to get FX and one of the retailers to work together to get me a UK spec MKII but I'll wait a bit.

I know few care about 10-12 fpe in guns like these but that power level makes a very sedate backyard plinker which is really all I do. l'll update this if I ever make any progress.




 
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When using a Huma regulator in the Wildcats you may use plenum spacer rings sized from a minimum of 10.5 mm all the way up to 15 mm, without the o-rings on the reg body blocking the vent hole. You can make rings of various sizes and see what effect different they have on your performance. You can make the rings from any tubing that fits the air tube, even 3/4" pvc pipe works just fine as it's outside diameter is only 26.75... I think you may be surprised at your results.

All the best, Chuck
 
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I had an hour to occupy this morning so I played around a little but testing will have to wait until this afternoon. My measuring must have been off but it sure looks like the stock FX spacer will work with the huma reg AND I found material that will take up more space within it if needed. I have nothing to lose so ful reassembly and testing will become my afternoon project.

Win or lose, it will take my mind off all the family junk going on. 3rd funeral in 3 months and tomorrow is a graveside birthday for my dad.... I'm kinda looking forward to Thursday. I'll report back this evening.

Thanks
 
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JCD the stock FX plenum spacer is 10 mm...the minimum plenum spacer ring that you can use with the Huma regulator is 10.5 mm. And the maximum size for a plenum spacer ring is 15 mm... I should know because I am the one who helped Huma develop a reg for the Wildcat and Streamline rifles. Try making one 10.5 mm and see how it affects your performance with your reg turned down to its minimum setting. 
 
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I'm done... If anyone is watching this and waiting on a success story, don't have one but here's a little info on the process.

At one point had the reg at 72, Didn't work on target, chrony results were 'ok' if I found a real nice place for the hammer spring. 

That was a fail, accuracy was horrible.

Part of the above was discussion was reducing the plenum (instead of changing out the valve spring or other). This was done in small increments using orings of all things. Was actually pretty simple but required disassemble many times. I can show pics of my 'fully loaded' (and last attempt) if anyone cares.

Limiting the plenum space plus small (further) reductions to the reg pressure got me a very nice chrony result at around 720 fps. Don't think I saved the strings.

Accuracy at 30y with JSB 8.4s was laughable, seriously. With 10.34's was 'ok' for the occasion group (groups were 8 shot/full mag), the more frequent group was 2-3 inches. NOT 'ok'.

After all the iterations, I think I had reg at about 58bar which may be too low for the reg to have maintained its integrity / reliable adjustability. Next steps will tell.

Back to were I was before all these extra attempts.... The FAC version isn't valved to work at NON-FAC speeds, or, the barrel I have simply wont do it. But another member received a gun shooting this low and has the same accuracy issues. That's enough for me to say it's not the reg.

This one is going back (again) to 19ish FPE and maybe for sale, with full disclosure of course.




 
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