FX Wildcat 25 MKII - Huma regulator is here!!

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Bring your chronograph with you and try readjusting your hammer spring nut just to see what happens... In my Wildcat I had to replace the original Hammer weight with one slightly heavier. The original Hammer weight in my Wildcat Wade 174.5 grains, I replaced it with one that weighed 190 grains which gave me an increase and velocity from about 880 ft per second up to the 900 feet per second I was seeking.
 
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I would like to see you begin cleaning and weighing and sorting your pellets. But for now I want you to understand that if you're shooting pellets that all way the same within a tenth of a grain your accuracy is going to be far greater and the numbers on your chronograph are going to be much much much tighter! Pellets of different weights give you much different numbers over the chronograph. In a can of pellets you will get weights ranging from 32.5 to 34.9... And your numbers over the chronograph reflect this very clearly. 

So if you can only get about 880 ft per second with your Factory Hammer weight in your wild cat, then have a machinist make you one out of breast similar to the original that weighs 190 grains... And with that heavier Hammer weight at about 9 and 3/4 turns in you should see 900 feet per second! 

Meanwhile remember that this is an art not a science... You will get there in the end. Good luck and have fun shooting at the farm this morning.
 
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A heavier Hammer weight explains a lot.

I can say for sure that right now I'm not interested in sorting pellets by weight or washing them, or getting a heavier Hammer made for me. There just isn't the time for that this summer.

If I can get the wild cat with the mark 2 heavies to perform as as consistently as my factory streamline, I will be one happy camper. If I cannot get the Heavies to perform I will just turn the regulator down and tune it for the 25 grain pellets.

I'm not looking to win matches I just need for the gun to be consistent so I can take out pest Birds.
 
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Here's a shot string at 8.25 turns in. Now to check for accuracy and wobble.
1527171674_2912183105b06ca5a5093c6.82632484_Screenshot_20180524-101756.png
 
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I agree it doesn't look great. And I still have some wobble. Less than before but still there. 100 yard group was better.....1" wide and about 2" tall. First two shots were next to eachother, third shot was a little higher and 4th and 5th were about the same as the third.

I have a ST-X barrel on the way. Going to leave the gun as is for now and see what happens with the new barrel. I know it has nothing to do with the regulator, but I was going to get an X barrel anyway.....part of the reason I bought the WC MKII. Maybe that will drop the velocity a smidge and stabilize the pellets. If not, then I guess I'll go to 8 turns on the HS. If that doesn't work, my thought is that I would need to drop the reg pressure to 150 maybe and crank the HS tension back up?
 
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Bob forgive me if I sounded like I was being critical but I wasn't... I was just flabbergasted! My Wildcat has an extreme spread of 6 feet per second with a standard deviation of 1.6 ft per second, so you understand why the shot string you created from today looked just terrible to me.

You say you bought this gun primarily for bird Pest Control so you don't need all that much energy to kill them efficiently and humanely. So why don't you try this... set your regulator down to 140 bar, and adjust your hammer spring tension until you find its Peak Performance and and find out what your velocity is with the MK2 pellets. If I remember correctly you will be about seven and a half turns in on your hammer spring nut, and with your reg set at 140 bar that should put you at about 830 or 840 feet per second which will be very accurate and still deliver 10 times more energy than you need to dispatch a pigeon.

I am confident that you will get it set right eventually, it's just going to take some trial and error to get you there. And just a reminder... check your feeding pin depth setting with your calipers each time you take the gun apart and put it back together.

 
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No forgiveness needed, the shot string isn't impressive.....I put it up primarily to show the reduced velocity. I bought the 25 because the farmer asked me to shoot skunks and raccoons......I already had the Streamline for birds. I've been using the WC on the birds, one because I can and secondly because I had to take my Streamline out of service because I needed the scope mounts from it in order to use the WC.

My thought about the regulator performance (I don't know how they work best which is why this is just a thought) is that the valve needs to be opened via sufficient hammer strike by whatever amount in order for the regulator to function at an optimal level? For example, one wouldn't choose a reg pressure of 160 bar and then set the HS to 5 turns right? Better would be to set reg at say 140 bar and HS to 7+ turns? Am I guessing at this correctly? This way the valve opens more fully so the awaiting air can come out more completely?

Just a thought, it's late and I need to get a few hours sleep before the boy needs to get up for school.

I am more than willing to tune the crap of the gun to get it where I would like it........good velocity, no pellet wobble....that's it. :)
 
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Well, turns out the weather today is great!! And I got my tank filled on the way to work this morning. I also have the gun and Chrono with me so I'll visit the range on my way home.

I guess the first thing I will find out is how much difference in velocity a 5 bar reduction on the regulator setting makes.

I'll post up a chart later. If tuning the HS gives me a velocity I like, I have a target with me as well and I'll check for accuracy at 50 and 75, and 100 if I have the time.
 
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"Bob_O"
"Bob_O"
CHUCK,
Click to expand...
It may be hard to answer, but I'll ask anyway.
Based upon the above, if I lower reg pressure by 5 bar (from 155 to 150) but left the HS at 8.25 turns, should that result in a decrease in velocity and if so, any idea of how much?
Click to expand...
28 fps slower averaged.

Here's a chart with the reg set at 150 and HS 8.5 turns in.
1527815927_19409636125b109ef74078c0.54671894_Screenshot_20180531-211237.png


I took scope cam video of 8 shots at 100 yds. I'll need to put it on the computer to check for wobble.....I'll do that in a little bit.

If be surprised if there was any, as I grouped 6 shots in 1" with 2 shots just outside that. I'll post the video as soon as I can.....I'm curious to see the pellets in slowmo (if visible) as to if they're flying true.
 
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Bob that shot string looks much better than the ones before, and your right about the energy level being more than adequate for what you will be using it for. And that was a wonderful video you made...no wobble as far as I could tell, and 1" to 1 1/2" groups at 100 yards is more than accurate enough for any small game you may hunt! Very nice concentric group for 6 of the shots...once you start weighing your pellets and shooting a magazine of pellets that all weigh the same to within 1/10th of a grain you can say goodbye to those annoying flyers too, unless of course a big wind gust grabs one. Me and my friend Gabe were shooting on Memorial Day in 16 mph wind that was gusting sometimes up to about 30 mph, and still getting one hole groups at 50 yards with no flyers with weighed, sorted, and lubed pellets.
chuck
 
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