Mods FX Ranchero Carbine in .177 & .22 Photos

Forums PCP Airguns Mods FX Ranchero Carbine in .177 & .22 Photos

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    zebra
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    Does anyone know why FX doesn’t use ST barrels on the Ranchero? I assumed that there needed to be a minimum length for ST barrels to be effective but, as Ernest has a ST on his, it seems like there must be a different reason.

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    mark404
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    I just bought a Ranchero about a month ago and it came with a smooth twist

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    sharroff
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    Mark404,

    Have you done any benchrested shooting at distance with it?  Accuracy report?

     

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    mark404
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    I have not had time to do some serious accuracy test yet but shooting off of a bag it is amazingly accurate, I did drop in a reg though.

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    sharroff
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    Mark404,

    How do you drop in a reg without seriously hurting shot count?

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    mark404
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    In this case you don’t….
    I now only get 19 full power shots from a 230 BAR fill.
    On the plus side the power curve is now flat

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    GriffyGriff
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    Before I bought my Ranchero I did shed loads of research on the internet about smooth twists versus rifled. 

    • I believe that smooth twist (ST) is both cheaper for the manufacturer to purchase, than walther lothar barrels.  As FX introduce the smooth twist manually at the end of the barrel. (Somewhere on YouTube there is a UK AirGun guy doing an FX Factory visit which shows this process).
    • As ST is just about 10cm at the END of the barrel, there is less pellet contact with the rifling and so less skirt deformation, which accounts for the high accuracy claims.
    • BUT I do not believe that ST works well on all pellets (especially at lower velocities). ST works on softer (purer) lead pellets like JSB Exacts, but harder pellets (those with less lead and mores additives), do not rotate as well due to the short rifling. I was given a tin of Accupels which apparently worked well in longer barrel FX Dominator and on the Ranchero the groupings were wide and ragged, where as the JSB and AirArms (same factory, slightly different dies) were really tight

    Without a regulator fitted though, I found the sweet spot on high power was with magazine 2 (I.e. Shots 9 – 16). 
    I tried switching power settings, but this changes the POI, so left it on high for the ST accuracy.  

    Has anyone got good accuracy with the lower power settings? If so, what range and what pellets please?

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    Serdac
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    So who sells a regulators for the FX Ranchero?

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    mark404
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    http://WWW.altaros.cz
    go to the FX tab and then go to FX models with air tube
    whats nice about these is that there is no drilling of the air tube.

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    sharroff
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    Until I get a new tube and barrel, I can live with 19 full power shots with that kind of extreme spread!.  I just ordered one for my Ranchero.  Nice installation video’s too.

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    puertorico
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    I’m getting 45 shots with my heavily modified ranchero that Ernest built me. It is one amazing carbine.

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    Serdac
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    “mark404”http://WWW.altaros.cz
    go to the FX tab and then go to FX models with air tube
    whats nice about these is that there is no drilling of the air tube.

    
I have one in .22 cal and would like at least 12-13 fpe for 16-20 shots.

    What should I pick for:
    1) Actual measured energy or energy given by the manufacturer and
    2) Required energy with regulator

    It’s required for the order on the Altaros site. Thanks.
     

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    puertorico
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    Serdac..contact Ernest. He put a mutant reg in mine

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    Serdac
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    Will do PR, I have family there if your still there, may have to look you up when I go.

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    mark404
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    I went with the 15.5 reg for both and adjusted it to the velocity I was looking for. 

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    sharroff
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    Me too.

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    Serdac
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    Was the velocity adjusted with different weight pellets or the low/medium/high lever?

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    sharroff
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    For me, really neither.  I use the same pellet weight and have it on high all the time (other than 5-6 yards at squirrels on the feeder).  I  use  the spring tension to do fine adjustments.for best fps / accuracy.  I got tired of taking the stock off and putting it back on for fine tuning / testing so I removed a bit of wood from around the brass fitting that controls spring tension so I could change it with the stock on.  I can set the gun from around 600 fps to 930 fps with this method.  At the moment the turret is setup for 17 fpe.

    The darker material on / around the brass spring adjustment is just loc tite blue to make sure it doesn’t move on its own.


     

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    GriffyGriff
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    Hi Sharroff,
    Thanks ever so much for the photo.  I never knew what this screw did and couldn’t find much information about it elsewhere.

    But after reading your report, I decided to give it a try on Saturday  (and as my wife was away for the weekend, this was a perfect opportunity) and I ended up spending over 6 hours checking and fine tuning the balance between power and accuracy.

    I have a .22 Ranchero and use either AirArms Field 16gr or JSB Exacts 15.9gr (my retailer said to try Webley Accupels, as he uses them on his FX rifles, but they were dreadfully inaccurate for  me). I have 3x 8 round magazines, shoot only on full power and refill after they have been used up.

    AIR ARMS FIELD 16gr
    ——————————
    I first chronographed the original setting to act as a base line in FPS, then plugged the numbers into a spread sheet and line graphed the results. I knew magazine 2 was the most accurate, but didn’t really know why until I saw the graph.  It turned out that the power curve was erratically increasing power on the 1st 8 shots from 716fps to 744fps.  Magazine 2 carried on increasing for the next three shots from 749fps – 754fps and then gently curved down for the remaining shots to 734fps.Magazine 3 plummeted from 731fps – 654fps. it looked like a trail of ants crisscrossing each other.

    So I decided not to mess around and wind the screw all the way in and work from there.  WOW!!
    The power upped to a max 846fps and a near-liner drop of approx 8fps on magazine 1, 12fps on mag 2 and 14 on mag 3.
    Mag 1: 846fps to 785fps
    Mag 2: 775fps to 691fps
    Mag 3: 680fps to 581fps
    The graph now showed 3 smoothly decreasing lines for each magazine.  Also I recorded the air in the gun after each magazine.
    Mag 1: 170 bar
    Mag 2: 120 bar
    Mag3:  90 bar

    I ran out of Air Arms Field and switched to JSB Exacts.

    JSB EXACTS 15.9gr
    —————————
    I repeated the full power shots again and got very similar results.
    Mag 1: 838fps to 785fps
    Mag 2: 799fps to 692fps
    Mag 3: 681fps to 597fps

    Mag 1: 170 bar
    Mag 2: 120 bar
    Mag3:  90 bar

    When I tested the accuracy over 22m repeatedly, it showed that Mag 1 was high by about 1cm, Mag 2 was spot on and Mag 3 was low by 0.5cm for the first 4 shots, then dropped between 1.5 to 2cm when the fps was about 630fps.

    So I started to wind back the power a quarter of a turn and retest for accuracy and eventually settled at a full turn from tight.  this gave me consistent groupings on a 2cm circle. the resulting fps figures are:
    Mag 1: 818fps to 785fps
    Mag 2: 775fps to 700fps
    Mag 3: 684fps to 606fps

    Mag 1: 170 bar
    Mag 2: 120 bar
    Mag3:  95 bar

    Now I just need to get some more AirArms Field pellets and recheck their accuracy, but overall really pleased, so thanks for the tip.

    By the way I couldn’t get anywhere near 900fps and wonder if yours is a .177?

    Thanks again.

    Regards Peter

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    sharroff
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    GriffyGrif,

    Yes, mine is a .177 and I usually shoot 10.34s.  Glad to see you’re getting your Ranchero setup the way you want it.  I’ll let you guys now how the Altaros regulator works out when it gets here.  

     

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