mubhaur

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    mubhaur
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    Glem.Chally

    Floris

    mubhaur

    Vadimas

    For those who shoot jsb 18gr, it is not at all necessary to buy a power plenum.

    Rather it becomes counterproductive for 18 grain  .22 pellets as far as accuracy is concerned 

     Why is that?

    I think Umair is missing the fact you can run at a way lower reg pressure.  I bet 100bar reg would send the 18s 900-1000.  With a different big plenum i can get the 34gr heavies in .25 at 1000 if wanted at 100 on the reg.

    In fact when I have to tune an Impact for extreme accuracy at long ranges, there are many combinations of HST, valve and regulator pressure that provide similar fps with a certain grain ofpellets.

    At that certain fps allcombinations are not equally accurate. 

    Swift and quick Pulse of air and longer but slower pulse of air make changes in accuracy of same pellets. 

    When I talk about extreme accuracy I do not mean achieving hunting accuracy or a certain fps.

    I prefer removing bigger plenum when I make best combination for extreme accuracy with 18 grain  .22 pellets. 

    Regards ,

    Umair Bhaur 

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    mubhaur
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    Vadimas

    For those who shoot jsb 18gr, it is not at all necessary to buy a power plenum.

    Rather it becomes counterproductive for 18 grain  .22 pellets as far as accuracy is concerned 

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    mubhaur
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    I have used Huma regulator in fx Royal 400 and found them more efficient and consistent. 

    RAW regulator design is very similar to that of FX Royal regulator. 

    But RAW regulator may be more consistent as said above.

    The good thing about Huma regulator is its size and very high pressure capability that can be productive for higher powers.

    Regards, 

    Umair Bhaur 

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    mubhaur
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    I have also tested an Impact with power plenum that could not produce real high powers.

    I could take it to 915 fps in .22 with 25 grain redesigned pellets at 150 reg pressure while gradually increasing the hammer tension but it was the limit.

    Regards,

     

    M. Umair Bhaur

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    mubhaur
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    SocalTrail

    My .22 crown was one of the most accurate airguns I ever put my hands on… sadly, as has been mentioned about, it had a zero shift almost every time it came out of the gun case or safe.  I was forced to sell it because I lost all confidence in the rifle and I primarily hunt with my Airguns. I’m still bummed and I’ve contemplated giving the crown a shot again and trying to figure out a way to get a LW or CZ barrel secured to the receiver better. 
     

    The telescopic shroud is the main cause of POI shift in Crown.  Just put a fixed shroud and you will feel much better. 

    Regards, 

    Umair Bhaur 

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    mubhaur
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    DrPutz

    I experienced a similar problem with my FX Crown 177 during a 25 yd bench rest match a couple of weeks ago. I watched the pellets walk their way first left then back, then down. No way to predict where they would fall. This is an extreme accuracy venue, with no external issues: gun stays on the rest and no wind inside. The difference is only a few mm at 25yds, but makes a difference in the score. I nearly matched my pcp score with my springer. 

    Anyway, I am thinking that it was the barrel spacer orings as well. I am experimenting with slightly larger ones as well as 90 duro ones.

    BTW, I also have a similar problem with my RAW TM1000. The tensioned barrel shifts after each shot and when moving the gun. I am trying a thread locker and rear vent and spacer to help eliminate this problem. So this isn't unique to FX

    Dan

    I have all respect for fx. Fredrik and Johan are great guys. 

    They help me a lot.

    I like fx products. Specially Impact. 

    But my RAW HM1000X doesn't have tensioned  barrel.

    It has free floating barrel. 

    Regards, 

    Umair Bhaur 

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    mubhaur
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    I think that real bull barrels with heavy gauge are used to overcome such issues. 

    I wonder why this has not come to detailed discussion before.

    Further the temperature change affects much more on x barrel due to many O rings and parts of the barrel. 

    Regards, 

    Umair Bhaur 

    • This reply was modified 3 weeks ago by mubhaur.
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    mubhaur
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    Replace the spring with a lighter and shorter spring.  This will make the trigger light and will help return after 1st stage.

    Adjustments are offcours necessary. 

    Regards, 

    Umair Bhaur 

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    mubhaur
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    Airgun-hobbyist

    While I haven't tried it yet, the use of harder 90 durometer o-ring inside of the barell support blocks should eliminate a lot of the barrel shift from storage.  Currently in hey are standard 70 durometer o-rings and they are soft and squishy, so as the barrel sits with some tension on it the o-rings shift a little.

    I have also been looking at placing a bushing on the barrel tube up under the front picatinny rail and drilling and tapping the rail to place 3 set screws on it.  This would lock the middle of the barrel in place, but without changing the hardness of the o-rings at the breech end it may still allow some shift.  It may also effect accuracy due to harmonics.  If this works, it is the simplest way to solidly affix the barrel and there is plenty of metal to drill and tap set screws in.  The nylon bushing band would be about 30mm o.d. with a 14mm i.d. and be wide enough to sit against the barrel support block but not come into contact with the barrel shroud.  

    I am thinking on the same lines.

    Regards, 

    Umair Bhaur 

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    mubhaur
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    L.Leon

    sonny

    FX walks the walk in competition, so if clicking the scope turrets now and then is to difficult for you than stick with what works for you. IMO RAW makes a great gun to lay on a bench but isn't really most hunters choice. 

    Yes in competition is where a lot of range queens shine, they can be catered to with various sundries. In the field not so much, if it can’t handle normal field conditions and maintain POI from session to session where’s the fun? And how can turning a turret be considered difficult😀? Though I do confess to rechecking zero regardless before going after critters. 

    I also recheck the zero often. My findings are based on rechecking of POI.

    Regards, 

    Umair Bhaur 

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    mubhaur
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    I had fx Royal 400  .22  and  Royal 500 in .25 in the past and never faced POI shift issue.

    Looks like the solid ST barrel was more sturdy.

    Regards, 

    Umair Bhaur 

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    mubhaur
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    Looks like as RAW has very stiff free float barrel covered with carbon fiber tube, there is little chance of coming any change in barrel position.  Also it is held with three big grub screws.

    On the other hand stx liner is supported by O rings and only one screw holds the barrel and even the outer cover of barrel is also held by O rings, the temperature changes and any other changes affect the POI quickly. 

    But once adjusted again, it shoots great again. 

    Regards, 

    Umair Bhaur 

    • This reply was modified 3 weeks ago by mubhaur.
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    bucketboy

    to rapid air..

     

     

    I have been a rapid fan for over 20years, the only gun I would swap my rapids for are RAWs only because I prefer the side cocking lever, everything else apart from the scope rails and stocks are for almost identical.

    However, I did buy a new gun recently, not because I thought it would be more accurate that the guns I already have  (I can’t see how it actually could be) but because I wanted to see what all the fuss was about. In many ways, it has exceeded my expectations but it has also confirmed my doubts.  The things I really like (and so do many other by the about of forum space it occupies) are the ease of adjustment, some of those, like the valve control knob would be an easy modification to do to the RAW, the externally adjustable reg would not be so easy but a back fillable reg inside the neck of the buddy bottle would free up plenum volume for those who are chasing power while also doing away with the v fill system allowing for an even larger valve cap plenum to be fitted. (This has already been done by a guy in his shed)

     

    There are a few issues that need to be resolved on the RAW to make it worthy of it price, fitting an unfinished spring on poorly fitting spring guide or the valve chamber and hammer channel not running concentric with each other, simply isn’t good enough. The new valve cap is a step forward but the long unstable valve return spring is truly horrible. Another part that has recently been changed is the one piece  hammer pip assembly, why on earth was that done?  It removes one on the most important tuning aids on the RAW/ rapid and that is the pip length. Getting a low powered gun to run consistently with a short hammer pip and week spring is a nightmare, it has a lock time measured in historic periods rather than milliseconds. Likewise, get power from a hammer with a long pip requires the spring from the rear axle of a 1960’s mustang. Whoever designed those parts clearly has no understanding of how the gun works.

    This might seem as though I am nit picking or a hate,  I really am not, what I am is frustrated at what I consider the best airgun available is being let down by small details that make a big and detrimental difference.  I am sorry but IMO, what come out of the factory does not close to the guns true potential.

     

    Bb

     

    Agreed 100%

    Regards 

    Umair Bhaur 

     

     

     

     

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    mubhaur
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    It was a wonderful forum and a lot of out of the box ideas were shared there.

    It's great loss as it was a serious forum regarding development and modifications of Rapid / RAW.

    It will be great if someone starts a new forum like that.

    Sorry to hear it Bb.

    Regards, 

    Umair Bhaur 

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    bucketboy

    I have a question for you guys who have indexed their barrel liners.
     

    What Dia is the spread variation at 30 yards you guys are getting?

     

    The reason I ask, I did mine today and it was repeatable each time I did it was a oval 7”high, 6” wide, does this seem excessive to you?  I does to me.  To confirm my results I did it both with moderator on and off, POI change was negligible (2-3 clicks)

     

    Bb

    Didn't do with stx barrel but in my .22 BSA barrel the circle at 24 yards was about 8" dia while with .25 BSA barrel it was only around 4".

    Bhaur 

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    heavy-impact

    mubhaur

    The external plenum is far better option as it can be removed any time during shooting. 

    It's a matter of couple of minutes to remove the external plenum and get full benefit of lighter pellets.

    Lighter pellets normally do not like low reg and high quantity plenum to achieve the accuracy with same fps.

    So to me external plenum is all the way.

    If someone never needs to shoot lighter pellets and always has to shoot slugs at high power then inbuilt fx power plenum is OK.

    Regards, 

    Umair Bhaur 

    You can keep higher reg pressure and lower velocity with the valve stop and hammer spring.

    I have tried all this but for lighter pellets I get best results with smaller plenum. 

    Umair Bhaur 

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    mubhaur
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    The external plenum is far better option as it can be removed any time during shooting. 

    It's a matter of couple of minutes to remove the external plenum and get full benefit of lighter pellets.

    Lighter pellets normally do not like low reg and high quantity plenum to achieve the accuracy with same fps.

    So to me external plenum is all the way.

    If someone never needs to shoot lighter pellets and always has to shoot slugs at high power then inbuilt fx power plenum is OK.

    Regards, 

    Umair Bhaur 

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    mubhaur
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    Great mod.

    Please advise details to get help.

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    mubhaur
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    sniperlabyo

    try M14 threads on the right has better performance compared to the 1/8 28 on the left 

    Dear Ernest,

    In my experience M14 offers more air flow that is not always required . Unless I have to use heavy slugs, I dont need M14.  Use of M14 for average weight pellets sometimes becomes counter productive for extreme accuracy.

    You see that in my design, the cap of the plenum is on the male side threads, so I can make one more cap of M14 if needed in any future time.

    Too low reg pressure some times compromises accuracy in my tests.

    Regards,

     

    Umair Bhaur

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    mubhaur
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    wajie316

    Great work. Can't wait to get my impact .22 upgraded from you umair

    Sure why not

Viewing 20 posts - 1 through 20 (of 593 total)